SAT Reading & Writing study guide · Chapter 19
Form, Structure, and Sense
CHAPTER TEN · STANDARD ENGLISH CONVENTIONS
In “Each of the students has their own opinion,” each controls the verb even though students is closer. The chapter focuses on finding the grammatical controller rather than trusting the nearest word.
College Board calls this skill Form, Structure, and Sense. A blank may require a verb form, pronoun/determiner, noun or possessive form, modifier, comparison/parallel structure, or another usage choice, and the question asks which form conforms to Standard English in that exact sentence. Some of these are settled by agreement with a word sitting a dozen words away. Others are settled by whether a clause has a tensed verb at all, by whether a noun is plural or possessive, or by what an opening phrase actually attaches to. Name the grammatical job the blank is doing first, and the right test follows from that naming.
Name the Grammatical Job First
Work out what kind of word the blank actually holds, then run the test that kind of word requires. A common error is matching the blank to the nearest noun or verb without ever identifying its real grammatical role.
If the blank holds a verb form, ask whether this clause already has a tensed verb, or whether the blank has to supply one; the answer comes from the structure of the clause itself. If it holds agreement, ask what the actual subject of this verb is; the answer comes from the main clause, with intervening phrases set aside. If it holds tense and aspect, ask when this action sits relative to the rest of the passage, and whether it is finished, continuing, or earlier than another past event; the answer comes from the passage’s timeline as a whole. If it holds a noun form, ask whether anything is owned here, and by one person or by many; the answer comes from the sentence’s own logic. If it holds a pronoun or determiner, ask what the antecedent is, and whether that antecedent is both clear and grammatically compatible; the answer comes from the antecedent itself, which must be unambiguous as well as matched in number. If it holds an introductory modifier, ask what this phrase is actually modifying; the answer comes from the noun phrase sitting right beside it. If it holds a parallel form, ask what slot this fills inside a series or a pair; the answer comes from the other items already in that series.
A verb answers to its subject, however far back that subject sits, and the usual distraction is a plural noun inside a phrase between the two. A pronoun answers to the single noun it stands for, and the tempting nearby noun is often of a different number. A possessive answers to its owner, and to whether that owner is one or many, and the embedded noun can carry an identical sound attached to a different spelling. A tense answers to the time marker and the other verbs around it, and the distraction is a verb sitting in an unrelated clause. An opening phrase answers to the noun immediately after the comma, and the sentence can begin with the wrong noun and still manage to read smoothly.
Find the True Subject
A phrase carrying a noun of the opposite number often stands directly between a subject and its verb. Temporarily set the intervening modifiers aside, and the agreement becomes clear.
The collection of letters, sent over four decades, is held here strips to the collection is held here: singular, since of letters belongs to a phrase rather than supplying the subject. The letters in the collection are held here strips to the letters are held here: plural, since in the collection is the phrase here instead. Among the papers are three unpublished drawings strips to three drawings are: plural, since the subject follows the verb in this inverted sentence. Each of the notebooks has an index of species strips to each has: singular, since each is singular as a subject, and every with a singular noun takes singular agreement the same way.
Do not mistake an embedded noun for the main subject. A phrase opening with of, in, with, along with, as well as, including, or between contains nouns and supplies none of them as the subject of the main clause. A relative clause opening with who, which, or that has a subject of its own and is likewise not the main clause’s subject. Cross the whole stretch out mentally and read what remains on both sides of the gap.
Follow the Passage Timeline
A tense question is settled by the timeline the passage builds, not by which form happens to sound best. Ask when the action sits relative to the rest of the passage, and whether it is finished, continuing, habitual, or earlier than another past event. The markers below are evidence about that timeline rather than commands, and a single marker can appear with more than one tense depending on the sense intended.
Time markers constrain a timeline but do not mechanically select a tense. Since 2015 or over the past decade often supports present perfect when the activity continues to the present: since 2015 the museum has digitized two hundred letters. A closed date such as in 1961 or last spring often supports simple past, for a closed time: in 1961 she sent the first of the letters. By the time can make past perfect useful when one past event must be shown as already complete before another: by the time the archive bought the papers, she had died. Before alone does not automatically require past perfect; check whether the sentence actually needs to mark one past event as complete before another, or whether simple past already does that job. Today or each year calls for simple present, for a standing state or habit: the archive opens to readers each weekday. The verbs around a given blank usually call for whatever tense the neighboring clauses use, unless the sense demands a genuine change: she collected the specimens and recorded them the same evening. And a clause with no tensed verb at all needs to be checked before any tense question can even apply; a later section covers exactly this.
Check for a Finite Main Verb
Some questions in this group are settled before tense or agreement ever arrives, simply by asking whether the clause has a working verb at all. A finite verb carries tense and can serve as the verb of a clause on its own. An infinitive or a participle cannot do that job alone.
A finite form, such as records, recorded, has recorded, or was recording, can serve as the verb of a clause and carry its tense. An infinitive, such as to record, can act as a noun or complete another verb, and it cannot be the verb of the clause by itself. A present participle, such as recording, can open a modifying phrase or follow a form of be; alone, it leaves the clause without a verb. A past participle, such as recorded in having been recorded, can open a modifying phrase or combine with have or be; alone, it leaves the clause without a verb too.
Find the main clause and check its verb. Strip the modifying phrases and read what remains. If nothing carries tense, the blank has to supply a finite verb, and every participial choice fails, whatever else it might offer. If the clause already has its verb, a participle in the blank is doing supplementary work instead, and it may well be exactly right.
Match Pronouns to Clear Antecedents
A pronoun takes the number of the noun it replaces. SAT items can place the antecedent far from the pronoun and a nearer noun of the opposite number in between.
A singular noun takes it, its, he, or she, and the distraction is usually a plural noun sitting in a phrase between them. Each, and standalone either or neither, take singular agreement in formal edited English, and the distraction is the plural noun that follows of; treat either…or and neither…nor separately from these standalone forms. A company, team, or committee usually takes it and its in American usage, treating the unit as one thing, and the distraction is a plural pronoun chosen by sound rather than by the actual antecedent. The subject of its own clause takes who; whom serves as an object rather than a subject, which is the usual distraction. The object of a verb or preposition takes whom in formal edited English, and the distraction is who, which sounds right and takes the wrong case. A noun already named takes this, these, that, or those, matched to its number, and the distraction is a determiner whose number contradicts the noun it introduces. And when two possible antecedents exist, the correct choice is a pronoun with one clear reference, or the noun repeated outright; a pronoun that could point to either of two nouns fails on clarity even when its number matches perfectly.
Use Apostrophes for Possession
Ask first whether anything is owned at all. Many of these questions are decided at that single step, because a plural noun and a possessive noun can sound identical while meaning something completely different. Then decide whether the owner is one or many.
If nothing is owned, use the plain plural with no apostrophe at all. If something is owned, ask whether there is one owner or many: one owner takes the apostrophe before the s, while several owners already ending in s take it after. And ask whether the word is actually a contraction: read it out in full, and if it is or it has fits, the apostrophe belongs to the contraction rather than to ownership.
Its means belonging to it: the museum protects its collection. It’s means it is or it has: read it out in full, and if it is fits, use the apostrophe. Botanist’s means belonging to one botanist, with the apostrophe standing before the s. Botanists’ means belonging to several botanists, with the apostrophe standing after the s. Botanists alone means more than one botanist, owning nothing at all, and takes no apostrophe.
Their, there, and they’re follow the same discipline. Their marks ownership, there marks a place or opens a sentence, and they’re expands to they are.
Attach Introductory Modifiers to the Right Noun
An introductory modifier must logically modify the noun phrase that follows it. That noun phrase has to be something capable of doing or undergoing what the phrase reports, and this holds for events, works, and abstractions just as much as it holds for people.
Trained as a botanist in Edinburgh, she recorded four decades of fieldwork in her letters is correct: she was trained. Trained as a botanist in Edinburgh, her letters record four decades of fieldwork is wrong: letters take no training. Trained as a botanist in Edinburgh, four decades of fieldwork appear in her letters is wrong, and it reads smoothly enough to pass unnoticed: the decades were not trained. Trained as a botanist in Edinburgh, the archive now holds her letters is wrong: a building did not study botany.
Keep Series and Pairs Parallel
Items joined in a series fill the same grammatical role and take a matching form. Find the role first, then match it. Nouns pair with nouns, finite verbs with finite verbs, gerunds with gerunds, and clauses with clauses.
A, B, and C demands three items of one kind: she collected, pressed, and labelled the specimens. Not only…but also demands the same form after each half: she not only collected the specimens but also labelled them. Either…or demands the same form after each half: the letters went either to her student or to her publisher. More…than demands two things of the same class compared: her notebooks hold more drawings than her letters do. Gerunds in a series demand every item in the -ing form: the work involved collecting, pressing, and labelling. Clauses in a series demand every item as a full clause: she noted where it grew, how tall it stood, and when it flowered.
Worked Examples of Form and Agreement
Find the Subject Across Modifiers
The collection of letters, sent over four decades by a botanist working in the Hebrides to her former student in Glasgow, ___ now held in the university archive.
A. are
B. were
C. is
D. have been
Cross out everything between the commas. What remains is the collection now held in the archive. C is the answer: a collection is one thing, so the verb is singular. A is matched to letters, which sits inside a phrase and cannot supply a subject. B is plural, so it fails on agreement before tense is even considered. D is plural, and it reaches back over a span the sentence never actually mentions.
Use Present Perfect for an Ongoing Span
Since 2015 the museum ___ more than two hundred of the letters, and the cataloguing continues today.
A. digitizes
B. digitized
C. has digitized
D. had digitized
C is the answer: work that began in 2015 and runs into the present needs present perfect. A describes a habit repeated in the present, which since will not accept. B describes a closed past, contradicted by continues today. D needs a later past event to sit before, and none arrives.
Show Singular and Plural Possession
The archive lends items to a single partner museum each season, provided that the museum can guarantee ___ own storage conditions.
A. it’s
B. its
C. their
D. there
B is the answer: one museum owns the conditions, and its is the possessive form. A expands to it is own storage conditions, which makes no sense; it’s is never a possessive. C is plural, and the sentence names one museum. D names a place and owns nothing at all.
Attach the Opening Modifier to Its Logical Noun
Trained as a botanist in Edinburgh and posted to a remote station in her twenties, ___
A. her letters record four decades of fieldwork in the islands
B. four decades of fieldwork appear in the letters she sent home
C. Margaret Fraser recorded four decades of fieldwork in her letters
D. the university archive now holds four decades of her fieldwork
C is the answer: a person was trained and posted, and the person arrives first. A puts letters after the comma, and letters were neither trained nor posted anywhere. B leaves decades attending Edinburgh, which they did not. D gives a building a botanical education it never received.
Check Agreement Beyond the Nearest Noun
A plural noun can sit beside a singular verb’s blank, and a singular noun can sit inside a phrase beside a plural subject; either direction can mislead a reader who matches to whatever noun sits closest.
The paintings that the museum recently acquired ___ being restored needs are, not is: museum is not the subject of the main clause, paintings is, and the relative clause that the museum recently acquired has its own internal subject-verb pair that never touches the main verb at all.
The lead researcher, together with three graduate assistants, ___ the samples needs examines or examined, not a plural form: the added phrase together with three graduate assistants does not turn researcher into a plural subject, the way and would.
Each of the notebooks has an index of species is correct as written: notebooks is plural inside the phrase, and each itself controls the agreement as the actual subject.
Either the letters or the notebook ___ missing from the collection needs is, agreeing with the nearer subject, notebook, in the standard rule for either…or; do not apply “either is always singular” blindly once two full subjects are joined this way, since the agreement can depend on which one sits closer to the verb.
Check Whether the Clause Already Has Its Main Verb
The species, first documented in 1894, ___ across the island needs a finite verb like ranges or is found; documented sits inside a supplement describing when the species was first recorded, and it cannot double as the main clause’s verb.
A long subject followed by several modifying phrases can contain multiple -ing and -ed forms without ever supplying the finite verb the clause actually needs: the team examining the samples every morning is not a complete sentence on its own; examining modifies team, and a finite verb such as found still has to arrive to complete it.
Researchers recorded the change uses recorded as a finite past verb. The change recorded by researchers was small uses that same word, recorded, inside a modifier instead; position and clause structure decide which job the word is doing, not the word’s own spelling.
To measure the effect accurately, the team repeated the trial uses the infinitive to measure to state purpose, while repeated carries the actual clause; an infinitive can express purpose and still never serve as the tensed verb a clause requires.
When answer choices mix finite and nonfinite forms outright, such as creates, creating, to create, and created all appearing together, the question may not be a tense question at all; ask first whether the blank has to complete a finite clause, or whether it needs to modify or complete some other structure entirely.
Use Sentence Structure to Choose Finite or Nonfinite Forms
Punctuation and grammar work together rather than punctuation deciding alone. A comma may close an introductory phrase, close a supplement, or separate two independent clauses; inspect the whole sentence before downgrading a verb to a participle just because a comma sits nearby.
The comet passed close to the planet, altering the planet’s orbit slightly is a complete sentence followed by a participial phrase; altering adds what happened as a result, and it is not attempting to be a second independent clause requiring its own subject and full verb.
Walking through the archive, the faded letters caught Maya’s attention incorrectly makes the letters the ones doing the walking; the noun immediately after an introductory participial phrase must logically perform or experience the action that phrase describes, and letters cannot walk anywhere.
Check Logical Modifier Attachment
The modifier can describe an object, an event, or an idea just as naturally as it describes a person; modifier questions are fundamentally about attachment, not about whether the following noun happens to be human.
Built in 1923, the bridge has carried traffic for a century is perfectly logical: a bridge can be built. The same test applies to abstractions: Proposed as a temporary measure, the policy remained in effect for a decade works, since a policy can be proposed, even though a policy is not a person.
Use Time Markers as Evidence
A time word is evidence about the timeline, not an instruction that mechanically forces one tense.
Today can appear with worked, works, has worked, or will work, depending on what the rest of the sentence’s timeline actually requires; the word alone does not select the tense. By 2018, the team had completed the survey places the completion before another past reference point; the named year alone does not automatically mean simple past, since by is doing the real work of placing one event before another. Since 2015 often contributes to a continuing-time reading, and since the road was closed can instead be entirely causal, meaning because; the word itself does not select a tense on its own. By the time sets a relationship between two events rather than fixing one tense outright; the real question is which event was already complete relative to the other, and whether the reference point itself is past, present, or future.
A passage can also shift from a general, standing fact to a specific past event, or the reverse, entirely legitimately: water freezes at zero degrees Celsius; in the 2024 trial, the sample froze at a lower measured temperature uses two different tenses correctly, because the two clauses state two different kinds of time, a general truth and a one-time measured event.
Check Pronoun Clarity and Agreement Separately
A pronoun matching the nearest noun in number is not automatically the answer if it could sensibly refer to another noun just as well; and a pronoun that agrees perfectly in number can still fail if two singular nouns could both be its intended referent.
The reviewers interviewed the applicants after the coordinators reviewed their files leaves their pointing at either the reviewers, the coordinators, or the applicants, since all three are plural nouns nearby; proximity alone does not settle which one is intended, so the noun should be repeated if the intended owner matters. When the sculpture was placed beside the pedestal, it appeared unstable leaves it pointing at either the sculpture or the pedestal, both singular; here the issue is clarity rather than number, since the pronoun agrees with either noun equally well.
Choose Pronouns by Grammatical Function
This finding and these findings have to agree with the noun they introduce directly. This and that can also point back to an entire earlier idea rather than to one specific noun, and that broader reference still has to be clear; a pronoun vaguely gesturing at several previous events can fail even when its number is technically fine. Who and whom depend on the job each one performs inside its own clause, not on the surrounding sentence: the scientist who led the team uses who as the subject of led; the scientist whom the team consulted uses whom as the object of consulted.
Separate Plurals, Possessives, and Contractions
Several researchers presented their findings needs no apostrophe on researchers merely because something later in the sentence belongs to them; a plural subject does not automatically pull an apostrophe toward it. The researcher’s notes means notes belonging to one researcher. The researchers’ notes means notes belonging to multiple researchers, once the regular plural already ends in s. Students, student’s, and students’ can be impossible to distinguish by sound alone; decide number and ownership from the sentence’s actual meaning before ever looking at where the apostrophe falls.
Apostrophe plus s does not signal an ordinary plural; apostrophes ordinarily mark possession or a contraction, never plain plural number on their own.
Build Parallel Structure by Function
What must match is grammatical function and construction, not superficial word-shape; do not force identical-looking endings onto items that legitimately use different forms in different roles within the same sentence.
The study aimed to identify the source, measure the rate, and estimate the cost shares three infinitives filling the same grammatical role after one shared to. Not only…but also can hide a mismatch even when both predicates look reasonable in isolation: she not only collected specimens but also labelled them keeps two parallel predicates, while swapping in an -ing phrase for one half would break the intended frame. Either…or can join parallel units of very different length without any problem, since parallelism concerns equivalent grammatical roles, not equal word counts. A comparison can change form partway through without announcing it: the new method is easier to use than to calibrate keeps two comparable infinitive structures, while a noun on one side and a clause on the other would distort the comparison being drawn. A list can start out parallel and break only on its final item, and long first items can make that final mismatch hard to hear; identify the repeated grammatical slot directly rather than relying on the sentence’s rhythm. And a modifier can be structurally attached to a noun while still making no sense: Standard English here includes sense along with form, so a grammatical sentence that describes something illogical is still wrong.
Match Agreement to Quantities and Fractions
A handful of quantity expressions decide their own verb by a rule that has nothing to do with the noun sitting closest to the blank.
A number of functions as a plural quantifier and takes a plural verb; the number of is not itself the grammatical head here: a number of studies have confirmed the pattern. The number of, with the definite article, flips this entirely, since number itself is now the head of the subject: the number of studies has grown steadily. A fraction or a percentage takes its verb from whatever noun it is measuring: half of the samples are contaminated, but half of the material is contaminated, the same word half producing two different verbs depending on what follows it. None of genuinely permits either a singular or a plural verb depending on context, and treating it as always singular is its own kind of error. An amount, a distance, or a span of time can take a singular verb when the sentence treats it as one unit, not as separate countable pieces: ten years is a long interval to wait. There is and there are still agree with whatever real subject follows the verb, not with the word there itself.
| Subject pattern | Verb agrees with |
|---|---|
| a number of + plural noun | the plural noun (plural verb) |
| the number of + plural noun | number itself (singular verb) |
| fraction or percentage of + noun | whatever the noun is measuring |
| none of + noun | context; either is possible |
| a span of time treated as one unit | the unit, not the individual pieces (singular) |
| there is / there are | the real postverbal subject |
| neither X nor Y / either X or Y | usually the nearer subject |
| one of the + plural noun | one (singular verb) |
Choose Pronoun Case by Function
Case errors are not limited to relative pronouns. Ordinary personal pronouns follow the identical logic, subject pronouns for subjects, object pronouns for objects, and the fastest check is removing everything else in a compound and listening to what remains.
Maya and I analyzed the samples leaves I analyzed once Maya and is removed, confirming the subject pronoun is correct. The director thanked Maya and me leaves thanked me, confirming the object pronoun. The same test resolves between you and me, an object of the preposition between, which never takes a subject pronoun no matter how formal between you and I might sound. The award was given to him and her follows the same subject/object test for the preposition to.
A reflexive pronoun needs its own antecedent already present in the sentence to attach to. The researchers themselves repeated the test is correct, since themselves refers back to researchers already named. The director asked Maya and myself to attend is not correct on the same logic between you and I fails: nothing in the sentence supplies the I or me that myself would need to refer back to, and me is what the sentence actually requires there.
Handle Joint and Separate Possession
An irregular plural still takes its possessive apostrophe after the full plural form, not by treating the word as though it ended in a regular s: children’s records, men’s division, women’s archive. None of these adds an apostrophe to a singular form first.
Joint and separate possession use the identical words in a different arrangement to signal a real difference in meaning. Maya and Leo’s project names one shared project belonging to both of them together. Maya’s and Leo’s projects names two separate projects, each belonging to just one of them. The apostrophe’s position, on the second name only versus on both names, is the entire signal distinguishing a shared thing from two separate things.
Build Parallel Comparisons
A comparison frame forces its two sides into the same grammatical shape, and the most common failure is comparing something on one side against a mismatched category on the other.
As X as Y needs comparable things on both sides: comparing an action against a person, or a quality against an object that cannot hold that quality, breaks the frame even when every individual word is spelled correctly. More X than Y fails the same way whenever the second term does not occupy the same grammatical slot the first term did. Rather than frequently pairs a gerund on one side with a finite clause on the other, which is not automatically wrong, but the two sides still need a structure that actually licenses the mismatch, not an accidental one. Between X and Y needs two genuinely parallel alternatives, not one specific option compared against a general category. Not only X but also Y is especially sensitive to where not only sits in the sentence, since its placement determines exactly which two elements the comparison is actually forcing into parallel.
Compared with the earlier model, the new design uses less material is correct because the new design is genuinely comparable to the earlier model, both instances of the same kind of thing. Compared with the earlier model, less material was used breaks the frame, since less material is not the kind of thing that can be sensibly compared with a model at all.
Distinguish Close Tense and Aspect Choices
Past perfect is not automatically correct every time an earlier event needs mentioning. It is needed only when the earlier-past relationship between two past events actually needs marking; converting every past event that happens to come first into had plus a participle overcorrects a timeline that was already clear from context or from words like before and after.
A closed date changes which present-perfect-versus-simple-past choice is correct. The lab published its findings in 2018 uses simple past because in 2018 closes the event to that specific year. The lab has published extensively since 2018 uses present perfect because since extends the activity up to the present moment instead of sealing it inside one past year.
A general truth or a standing scientific fact can stay in present tense even while it sits inside a passage otherwise written in the past. Researchers confirmed that the compound dissolves readily in cold water keeps dissolves in the present, since the compound’s behavior is a standing fact true regardless of when the confirming research happened, while confirmed correctly marks the research itself as a past event.
Use This Method
1. Read the blank and name what belongs there: a verb, a pronoun, a possessive, or a whole clause.
2. Find what controls the form: the subject, the antecedent, the owner, the timeline, the clause structure, or the parallel slot.
3. Cross out everything between the controlling word and the blank, and read the two together.
4. Check the time whenever a verb is in play; a marker or a neighboring clause usually fixes it.
5. Choose by rule, and let the sound of the sentence go.
Compare Close Grammar Choices
The answer is often decided before the choices are even read. Find the job first: a verb answers to its subject, its clause, or the timeline; a pronoun answers to its referent; an apostrophe answers to ownership; a modifier answers to the noun it actually describes.
| Pair | The distinction |
|---|---|
| nearest noun / true subject | The noun closest to the verb may sit inside a prepositional phrase, relative clause, or supplement. Agreement belongs to the subject of the relevant clause. |
| finite verb / participle | A finite verb can carry tense and complete a clause. A participle such as creating or created can modify or supplement but may leave the main clause without its verb. |
| finite verb / infinitive | Works or worked can serve as a finite predicate. To work cannot by itself complete the main clause. |
| past verb / past participle | They recorded the result uses recorded as the finite past verb. The result recorded yesterday… uses recorded to modify result and still needs a finite verb elsewhere. |
| main clause verb / verb inside a modifier | The researcher who studies coral works in Fiji has studies inside the relative clause and works as the main-clause verb. |
| tense / finiteness | Was, has been, and will be differ in tense and aspect. Being and to be differ in whether they can fill the finite slot at all. Decide which problem the sentence actually presents. |
| simple past / past perfect | Past perfect can mark an event already completed before another past reference point. Do not use it merely because two past events both appear. |
| simple present / present perfect | Simple present often states a current, habitual, or general fact. Present perfect connects a past activity or state to a present reference point. Context decides which one fits. |
| time word / timeline | Since, today, by, before, and now are clues, not commands. The whole sequence of events determines the actual tense and aspect. |
| same tense / same time meaning | Nearby verbs need not share a tense if they refer to different times, or if one states a continuing or general fact. |
| pronoun number / pronoun clarity | A singular pronoun can agree numerically and still be unclear if two singular nouns could equally be its referent. |
| pronoun / possessive determiner | They or them can stand as noun phrases; their must introduce or modify a noun. The blank’s own grammatical job decides which is needed. |
| this / these | This points to singular material; these points to plural. Check the noun or idea actually intended. |
| who / whom | Who performs the verb in its own clause; whom receives the action or follows a preposition in formal edited English. |
| Pair | The distinction |
|---|---|
| whose / who’s | Whose shows possession and can apply to people or things. Who’s is the contraction of who is or who has; expanding it exposes the difference the same way it’s does. |
| plural / possessive | Researchers means more than one researcher. Researcher’s means belonging to one. Researchers’ means belonging to more than one. |
| its / it’s | Possession versus it is or it has. Expanding it’s exposes the difference immediately. |
| their / they’re / there | Possession versus they are versus location or existence. |
| introductory modifier / subject that follows | After completing the survey, Maya… makes Maya the one who completed it. The noun right after the comma must logically fit the modifier. |
| grammatical attachment / logical attachment | A modifier can sit beside a noun and still make nonsense. Both syntax and meaning have to work at once. |
| person / thing after a modifier | No special person-only rule exists. Built in 1890, the library… works because the library is what was built. |
| parallel words / parallel roles | The repeated pieces should perform matching grammatical jobs. Surface endings alone are not the actual test. |
| noun / gerund | A noun and an -ing form can sometimes fill similar semantic roles, and in a deliberately parallel list the construction still has to stay grammatically balanced. |
| to + verb / bare verb | Parallel infinitives can share one to: to measure, compare, and record. Do not demand a repeated to when the construction legitimately shares it. |
| not only X / but also Y | X and Y should occupy parallel grammatical slots. The placement of not only determines exactly what has to be matched. |
| either X / or Y | The two alternatives should be grammatically parallel; agreement of a following verb is a separate question entirely. |
| each / each of the plural nouns | The plural noun inside of does not automatically control the main verb. Each is the actual head of the subject construction. |
| collective noun / plural members | Team, committee, and company can be treated as singular units in standard American usage, without building a rule that every collective reference must always be it or its regardless of the sentence’s actual meaning. |
| article or determiner / noun number | This, these, that, those, a, and an can reveal the noun form the sentence requires; they are part of the grammar, not decoration. |
| possession / contraction | An apostrophe can signal either one. Decide whether the sentence means ownership or omitted letters. |
| one owner / multiple owners | The student’s project versus the students’ project. Number belongs to the owner; the apostrophe marks possession. |
| completed action / ongoing or repeated action | Aspect can matter even when the calendar time is identical. Ask how the action is being viewed, not only when it occurred. |
| main action / supplementary action | A finite verb can carry the sentence while an -ing or -ed phrase adds a simultaneous, resulting, or descriptive action alongside it. |
| idiomatic preposition / logical preposition | Some preposition pairings are idiomatic and must be learned from usage. For example, capable takes of. Compare to and compare with overlap substantially in modern edited English; do not use a rigid similarity-versus-difference rule unless the sentence itself establishes the intended construction. |
| active voice / passive voice | Active and passive voice are both grammatical. Choose the form that preserves the sentence’s intended subject, agent, tense, and parallel |
| Pair | The distinction |
|---|---|
| structure. Do not reject passive voice merely for being passive. | |
| concise phrasing / needless repetition | When grammar and meaning are otherwise identical, avoid needless repetition; however, do not treat shortest as automatically correct. |
| adjective / adverb | An adjective modifies a noun or pronoun; an adverb modifies a verb, adjective, or another adverb. The results were quick describes the results themselves, while the results arrived quickly describes how they arrived, and swapping the two forms breaks what each word is actually supposed to modify. |
| two independent sentences / one combined sentence | Combining two related sentences into one is only correct when the new connector accurately states the logical relationship between them; a grammatically legal combination can still misrepresent how the two original ideas were actually related. |
Practice
Question 1
- AA. is
- BB. are
- CC. was
- DD. has been
Question 2
- AA. is dead
- BB. died
- CC. had been dead
- DD. has been dead
Question 3
- AA. who
- BB. whom
- CC. which
- DD. whose
Question 4
- AA. botanists
- BB. botanist’s
- CC. botanists’
- DD. botanists’s
Question 5
- AA. but also labelled
- BB. but also labelling
- CC. and also the labelling of
- DD. while she was labelling
Question 6
- AA. showing
- BB. to show
- CC. show
- DD. having shown
Question 7
- AA. It was compiled
- BB. Compiled
- CC. Compiles
- DD. The team compiled
Question 8
- AA. fewer
- BB. less
- CC. lesser
- DD. least
Question 9
- AA. cautious
- BB. cautiously
- CC. more cautious
- DD. most cautious
Question 10
- AA. reflects
- BB. reflect
- CC. devours
- DD. devour
Question 11
- AA. , and
- BB. and
- CC. ,
- DD. but
Question 12
- AA. this
- BB. these
- CC. that
- DD. it
Answers and Explanations
Show the answers and explanations
1. B. The sentence is inverted, and the subject follows the verb: three drawings is the actual subject, plural. A and C match a singular form to a subject that does not exist in that form. D is singular and opens a span the sentence never actually sets.
2. C. By the time puts two past moments in explicit order, and had been dead correctly marks the earlier one. A gives a present state inside a sentence set in 1994. B names a single moment, died, when the sentence measures a stretch of almost a decade. D reaches forward to the present when the sentence stops in 1994.
3. B. She already has its subject; the pronoun receives the action of taught, which makes it an object and calls for whom. A would need a verb of its own for who to be doing the acting. C stands for things, and student is a person. D marks ownership, and nothing is owned here.
4. B. One botanist owns the notebooks, so the botanist’s is correct. A carries no apostrophe and no ownership at all. C multiplies the botanist into several owners the passage never describes. D is not a form used for a regular plural.
5. A. Not only demands but also with a matching verb form on the other side; collected and labelled share the same form. B, C, and D each change form partway through or break the correlative pair outright.
6. C. Strip the two modifying phrases, and the main clause has a subject, the plates, and no verb, so the blank must supply a finite one. A and D are participial forms that leave the sentence without a main verb. B is an infinitive, which cannot serve as the verb of a clause either.
7. B. The main clause after the comma, the survey remains, already has its subject and verb, so the opening has to be a modifying phrase rather than a second full clause. A and D each supply a full clause joined to another full clause by a comma alone, a splice. C supplies a finite verb with nothing in front of it to do the compiling.
8. B. Less. Wastewater is a mass noun, measured as a quantity instead of counted as separate units, and mass nouns take less. A applies fewer, which is reserved for countable nouns like samples or gallons, not the substance itself. C and D both misuse comparative and superlative forms that do not fit a two-way comparison across time.
9. B. Cautiously. The blank describes how the technician moved, a verb, which calls for an adverb. A supplies an adjective where the sentence needs to modify an action, not a noun. C and D both keep the adjective form and add a comparison the sentence never sets up; nothing here compares the technician’s caution to anyone else’s.
10. A. Reflects. The verb agrees with the singular subject report, and reflecting the original responses is something a report can actually do. B repeats the correct meaning but breaks agreement with the singular subject. C keeps the correct singular agreement but assigns the report an action, devouring, that a document cannot perform. D combines both errors: wrong agreement and an impossible action.
11. B. And. Both verbs, organized and created, share the single subject the volunteers, forming one compound predicate rather than two independent clauses; a compound predicate with a shared subject takes no comma before the coordinating conjunction. A adds a comma that would only be justified if a second subject followed and. C drops the conjunction entirely, leaving a comma sitting between two verb phrases with nothing coordinating them. D introduces a contrast the sentence’s two complementary actions do not support.
12. B. These. The demonstrative has to agree with the noun it directly modifies, extended absences, which is plural, not with a researcher earlier in the sentence. A and C both supply singular demonstratives that cannot modify a plural noun. D supplies a pronoun, not a determiner, and does not fit grammatically in front of extended absences at all.
Items 6 and 7 turn on the same question asked from opposite ends. Strip the modifying material, find the main clause, and check whether it already has a tensed verb. When it does, the blank takes a participle. When it does not, every participle in the list fails.
Final Checks Before You Answer
Do not choose by sound. Read the sentence as a structure. A polished wrong answer often agrees with the closest noun, matches the tense of a nearby verb, uses the familiar apostrophe, or gives a modifier a noun that is grammatically present but logically impossible. Each check below comes with its own worked item.
When the blank is a verb, first ask whether the real question is agreement, tense and aspect, or finiteness, since a form can pass one test and fail another; and when the sentence already contains several verbs, assign each one to its own clause or modifier before deciding that another finite form is needed anywhere else.
The reports that the committee submitted last quarter, along with a revised budget still under review, ___ scheduled for discussion at Thursday’s meeting.
A. is
B. was
C. are
D. has been
Reports is the actual subject; that the committee submitted last quarter is a relative clause with its own internal subject and verb, and along with a revised budget still under review is a phrase, not a second subject joined by and. C agrees with the plural reports, in the present tense the meeting context calls for. A and B both match a singular form to a subject that is actually plural. D reaches for a present-perfect span the sentence never sets up.
When an -ing form appears among the choices, check whether it is a participle or gerund doing supplementary work rather than the clause’s main verb, and confirm whether the clause is otherwise complete; and when a to + verb form appears, remember it can express purpose or fill another nonfinite role without ever carrying the main-clause tense.
While ___ the migration patterns of three whale populations over an eighteen-month survey, the research team relied on satellite tags rather than visual surveys.
A. tracking
B. tracked
C. to track
D. track
The main clause after the comma, the research team relied on satellite tags, already has its own subject and finite verb, so the opening needs a modifying phrase, not another finite clause. A supplies a present participle that logically modifies the research team, the ones doing the tracking, and combines correctly with while. B is a past participle that would need a different surrounding structure to attach correctly, and while cannot introduce it this way. C, an infinitive, cannot follow while at all; while requires an ongoing action, not a stated goal. D is a bare, untensed form that cannot open a modifying phrase after while either.
A comma appearing before the blank does not by itself decide whether the verb there must be nonfinite; and when the subject of the sentence is long, strip away the modifiers temporarily and set what remains directly beside the verb before judging agreement.
The lighthouse keeper’s daughter, who transcribed decades of weather logs by hand before the station was automated in the 1970s, ___ meticulous records that historians still consult today.
A. leaving
B. left
C. to leave
D. leaves
The comma here closes a supplement, who transcribed decades of weather logs…, and does not by itself signal that a nonfinite form belongs at the blank; stripped of that supplement, the sentence reads the daughter ___ meticulous records, which still needs its own finite verb. B supplies it: her transcribing work is framed as completed before the station’s automation in the 1970s, a finished past action, and records she left behind can still be consulted today without requiring the verb describing her own past action to also be present tense. D makes exactly that mistake, treating present-day consultation as a reason the daughter’s own act of creating the records must be present tense too; a past action can have ongoing present consequences without changing its own tense; a writer who left manuscripts scholars still study today did the leaving in the past regardless of how current the studying is. A and C are both nonfinite and would leave this stripped clause without any verb at all.
A phrase opening with of plus a plural noun, a relative clause opening with who, which, or that, and additions such as together with, as well as, or along with can each look like they supply or expand the subject, and none of them automatically does.
The director of several regional offices, together with two senior analysts, ___ presenting the annual findings this year.
A. are
B. is
C. were
D. have been
Director is the actual subject; of several regional offices is a phrase, and together with two senior analysts is an addition that does not create a compound subject the way and would. B agrees with the singular director. A, C, and D each treat the sentence as though it had a plural or compound subject that was never actually established.
When each appears, keep its simple, always-singular construction separate from either…or and neither…nor, which require identifying both subjects and the actual agreement rule those pairs create; and when the passage contains a date, use it to help build the surrounding timeline rather than treating it as an automatic signal for simple past.
By 2016, each of the three field stations ___ its own weather monitoring equipment, though only one had begun sharing data publicly.
A. have installed
B. has installed
C. had installed
D. installs
Each is singular, ruling out A. Between B and C, by 2016 places the installation before a reference point, and the second clause’s had begun signals that the relevant reference point is itself in the past, which calls for past perfect. C matches that timeline. D is present tense, which does not fit a sentence anchored by by 2016 and a later past-perfect clause at all.
Determine whether since marks a span of time or means because, since the two readings can call for genuinely different tenses; and separately, nearby verbs being uniformly past does not mean every verb in the passage has to match them, since a clause stating a continuing or general fact can legitimately stay in the present.
Since the original survey relied on outdated maps, researchers ___ the boundary lines entirely, and the coastline still shifts too quickly for any single survey to stay accurate for long.
A. redrew
B. have redrawn
C. redraw
D. had redrawn
Here since means because, not a time span, which the surrounding past-tense narrative confirms; A matches that reading with simple past. B misreads since as marking a continuing span reaching the present. D reaches for an earlier past event that nothing else in the sentence sets up. C is present tense, appropriate for the sentence’s closing general fact about the coastline, and not appropriate for the specific act of redrawing the boundary lines that already happened.
When the blank is a pronoun, find exactly what it refers to before checking whether that referent is unambiguous, since agreement in number and clarity of reference are two separate tests, and a choice can pass one while failing the other.
After the foundation transferred its assets to a newly formed trust, the trust voted through its board to open ___ first round of grant applications the following month.
A. its
B. their
C. this
D. these
The trust is the singular subject of voted, with its board sitting inside a modifying phrase rather than competing for the antecedent role. A correctly uses the singular possessive to refer back to the trust. B is plural, agreeing with neither the trust nor the board, both singular. C and D are demonstratives that would need a specific prior idea or noun to point to, not a straightforward possessive relationship like this one.
When a choice offers this or these, check the number of the noun or idea actually being referred to; when a choice offers who or whom, test its job inside its own clause rather than the main sentence; and when a choice carries an apostrophe, ask first whether possession or a contraction is even needed at all.
The engineer ___ the city hired to inspect the bridge found no structural concerns, a finding that surprised residents who had pushed for the project’s delay.
A. who
B. whom
C. which
D. whose
The city hired the engineer, so the pronoun receives the action and functions as an object inside its own clause, calling for B. A would need the engineer to be doing the hiring rather than receiving it. C stands for things rather than people. D marks ownership, and nothing is owned in this clause.
When the noun in question means more than one, plural alone takes no apostrophe; when one person owns something, use the singular possessive form; and when several regular plural owners share ownership, the possessive apostrophe generally follows that existing plural s.
The volunteers spent the weekend cataloguing donations for the shelter’s upcoming fundraiser, and the shelter’s director praised the volunteers’ dedication in a note posted the following Monday.
Which possessive is used incorrectly if the sentence instead read “the volunteer’s dedication,” referring to the whole group of volunteers collectively?
A. It would incorrectly assign the dedication to a single volunteer rather than the group
B. It would be interchangeable with “volunteers’ dedication”
C. It would correctly describe group dedication
D. It would need no apostrophe at all
A is correct: volunteer’s names one owner, while the sentence intends dedication belonging to the whole group, which needs volunteers’ instead, apostrophe after the existing plural s. B treats two different possessive forms as interchangeable when they name different owners entirely. C misapplies the singular form to a group meaning. D ignores that ownership, group dedication, genuinely is being expressed here and does need an apostrophe somewhere.
When the choices include its and it’s, expand it’s to it is or it has before deciding; and when the choices include their, they’re, and there, translate each one before reading for sound, since sound alone will not distinguish them reliably.
The observatory upgraded ___ imaging system last year, and ___ now able to capture images ___ own engineers once thought impossible with the old equipment.
A. its … it’s … their
B. it’s … its … they’re
C. its … it’s … they’re
D. its … its … their
Expanding each contraction in turn: the first blank needs possession (belonging to the observatory), the second needs it is (a state now true of the observatory), and the third needs possession again (belonging to the engineers, plural). A gets all three right: its (possessive), it’s (it is), their (possessive, plural engineers). B and C both misplace it’s where possession is needed. D uses its for the plural engineers’ ownership, where the plural possessive their is required instead.
When a sentence opens with an -ing or -ed phrase, the noun immediately after that introductory modifier must logically be what the phrase actually describes; and when the noun after a modifier is not a person, that construction can still be entirely correct, just as a sentence that sounds slightly unusual can still be structurally right, and a sentence that sounds smooth can still be structurally wrong.
Weathered by nearly a century of coastal storms, the lighthouse’s original lens was finally replaced last spring.
Which choice correctly identifies what the opening phrase modifies?
A. The lighthouse’s original lens, which the storms wore down over time
B. The lighthouse itself, even though the sentence’s grammatical subject is the lens
C. The coastal storms
D. Last spring
A is correct: the lighthouse’s original lens is the noun phrase immediately following the introductory modifier, and a lens can indeed be weathered by storms over time; the sentence is not about a person, and it is still logically sound. B assumes the modifier must describe the lighthouse structurally, when the sentence’s actual grammatical subject is the lens. C and D both misidentify the modifier’s target entirely.
When a sentence contains a list, locate the exact repeated grammatical slot in every single item rather than relying on how the sentence sounds; when not only appears, find precisely what follows it and match the corresponding element after but also; and when either…or appears, check both the parallel form and, as a separate question, any verb agreement the construction creates.
The renovation plan calls for reinforcing the foundation, the installation of new wiring, and to repaint the exterior by autumn.
Which choice best corrects the list?
A. reinforcing the foundation, installing new wiring, and repainting the exterior
B. to reinforce the foundation, the installation of new wiring, and repainting the exterior
C. reinforcing the foundation, new wiring installed, and to repaint the exterior
D. the reinforcement of the foundation, installing new wiring, and to repaint the exterior
A puts all three items into the same gerund form, reinforcing, installing, repainting, matching the repeated slot exactly. B, C, and D each leave at least one item in a different grammatical shape than the other two, breaking the parallel structure the list requires.
When answer choices use forms that look different from each other, that difference can still be correct if the roles genuinely differ; and when answer choices use forms that look identical to each other, they can still differ in tense, number, reference, or logical attachment elsewhere in the sentence, so identical appearance never guarantees they are interchangeable.
The scientist’s notebook, filled with entries spanning three field seasons, provides insight into observations that ___ largely by hand at the time.
A. was recorded
B. were recorded
C. are recorded
D. is recorded
Observations is plural, ruling out any singular form despite each choice otherwise looking like a plausible past-tense passive; B agrees with observations and stays in the past tense the “at the time” phrase requires. A and D both match a singular verb to a plural subject, an error easy to miss when the words immediately around the blank look identical in structure to the correct choice. C shifts to present tense, contradicting at the time.
When one candidate answer fixes agreement but breaks the surrounding timeline, or fixes tense but leaves the clause without a working main verb, or fixes number but creates a newly unclear pronoun, or supplies a possessive where the sentence actually needed a simple plural, every one of these is a case where a form can satisfy one grammatical requirement while failing a different one nearby, and both requirements have to hold at once.
The two research assistants, each responsible for a separate testing site, ___ their preliminary results to the lead investigator before comparing notes with each other.
A. submits
B. submitting
C. submitted
D. has submitted
Assistants is the actual plural subject; each responsible for a separate testing site is a supplement, not a second subject. C agrees with the plural subject and supplies a genuine finite verb in a tense consistent with the rest of the sentence. A fixes nothing, since it wrongly matches a singular form to a plural subject. B abandons finiteness entirely, leaving the clause without a working main verb even though it might seem to agree in a loose sense. D fixes number in the wrong direction, matching a singular auxiliary to a plural subject while also reaching for a present-perfect span the sentence does not call for.
When two surviving choices both sound entirely grammatical, return to the blank’s exact job one more time, since the real distinction between them is often timeline, reference, ownership, or logical modifier attachment rather than anything audible; and when nothing at all seems to control the blank, widen your search to the subject, clause completeness, the antecedent, time sequence, the owner, the modifier’s target, or a repeated structure elsewhere in the sentence.
Recovered from the wreck in 1987 after nearly two centuries underwater, the ship’s log ___ details that no surviving crew account had ever mentioned.
A. revealed
B. revealing
C. to reveal
D. reveals
Both A and D can sound equally natural read aloud, and the real distinction is finiteness first: the main clause needs its own working verb, which rules out the nonfinite B and C immediately. Between the two finite options, the explicit date anchors the recovery to one specific past event, and the sentence’s own past perfect, had ever mentioned, places the crew accounts’ silence before that same past moment. A detail revealed at the moment of a 1987 recovery belongs to that same past narrative, which favors A. D would fit a sentence built around the log as a standing, present source of information rather than one dated discovery, and the explicit year here rules out that frame.