Form, structure, and sense: modifiers, plurals and possessives
1 h 10 min of study
This unit is ≈13% of the SAT, across 5 lessons. Full syllabus
Lesson 3 of 5 · Standard English conventions
Form, structure, and sense: agreement
7 min read · about 1 h 30 min with practice3 quick checks≈3% of the testCore: Core: tested on most papers
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Agreement is the classic Form, Structure, and Sense question: the choices show the same verb or pronoun in singular and plural forms (often with a tense twist), and only one matches its subject or antecedent. The rule is simple. The difficulty is that the SAT hides the true subject behind long phrases, inverted word order and plural decoys placed right next to the blank. Learn to find the subject in five seconds and these become guaranteed points.
By the end you’ll be able to
Make verbs agree with subjects separated by long intervening phrases or clauses
Handle collective nouns, indefinite pronouns, compound subjects and inverted sentence order
Make pronouns agree in number with their antecedents (it/its vs. they/their) and avoid ambiguous reference
Choose the correct pronoun case (subject vs. object vs. possessive)
What the exam asks
The stem is always Which choice completes the text so that it conforms to the conventions of Standard English? You know it’s an agreement item from the choices:
Subject–verb agreement (the most common): has / have / were / are, depicts / depict / are depicting / have depicted.
Pronoun–antecedent agreement:its / their / it’s / they’re, or it / they.
Pronoun case (occasionally): she / her / herself / hers.
Typically three choices share the wrong number and one has the right number. When two choices have the right number, the tense decides between them. Hard items bury the subject under a relative clause, invert the sentence, or use a subject that looks plural but isn’t (the number of…, what she found…, the Netherlands).
Core ideas
Step 1: Find the true subject
Bracket everything that can’t be the subject:
prepositional phrases (of more than 2,000 letters, among the tablets, in the canopies of tropical forests);
anything set off by paired commas or dashes (, which includes biologists from four universities,);
relative clauses (who…, which…, that…, to which…).
The noun left in front of the verb is the subject. In A collection (of letters) (written by soldiers) (from Ohio) ______ digitized, the subject is collection, so the verb is has.
Step 2: Apply the number rules
vii.Check your understanding
3 questions on form, structure, and sense: agreement. Every option is explained once you answer.
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When a sentence opens with Among…, Beneath…, Here…, There… or a participle (Hidden among…, Embedded in…), the subject usually comes after the verb. Flip the sentence: Among the objects was a bronze device → A bronze device was among the objects.
Step 4: Check the tense too
Agreement choices often mix number and tense. After you find the right number, match the passage’s timeline: a past narrative takes the past, since/for running up to now takes the present perfect, and a general fact takes the present.
Pronoun–antecedent agreement
Find the antecedent by meaning. Ask whose? or what?: the ants…cultivate a fungus, which serves as ______ main food → the ants’ food → their.
It, its are singular; they, them, their are plural.
Organizations, collective nouns and countries take it and its: the team…its findings; the Netherlands…its land.
Expand every contraction before choosing: it’s = it is, they’re = they are, who’s = who is.
Stay consistent: if the passage has already used its for something, the next pronoun for it is its as well.
Pronoun case
Subject
Object
Possessive
I, he, she, we, they, who
me, him, her, us, them, whom
mine, his, hers, ours, theirs, whose
In compounds, drop the other person: invited Keller and ______ → invited her. Reflexives (herself, themselves) only point back to the subject of the same clause: Ferreira nominated herself.
Worked examples
Exam technique
Read the choices first. If they differ in number (has/have, its/their), it’s an agreement item. If they also differ in tense, you will need two checks.
Bracket, then say the core aloud in your head: subject + verb (The discovery…suggests). Errors that hide in the full sentence become obvious in the stripped one.
Circle the noun before of. It’s the subject in almost every SAT agreement item.
Flip any sentence that opens with a prepositional or participial phrase.
For pronouns, ask whose or what, then expand contractions.
Use the passage’s own clues. A later its or a singular verb elsewhere in the passage often confirms the number.
Pace: 30–45 seconds. The hardest items need one extra step (inversion or a clause subject), not more reading.
Common mistakes
Quick recap
Find the subject by bracketing prepositional phrases, interrupters and relative clauses.
The noun before of is almost always the subject.
And makes a plural subject; as well as, along with and together with do not.
Either/or and neither/nor agree with the nearer subject.
The number of, each, collective nouns, gerund phrases and what or that clauses are singular.
Flip inverted sentences to find a subject that follows the verb.
Pronouns match their antecedent by meaning: it/its for one thing or organization, they/their for several.