How to solve SAT Form, Structure, and Sense grammar questions

Form, Structure, and Sense questions test grammar inside the sentence: subject-verb agreement, pronoun-antecedent agreement, verb tense and form, plurals and possessives, and the placement of modifiers. They belong to the Standard English Conventions domain, about 26% of the Reading and Writing section, or roughly 11 to 15 questions shared with Boundaries. Expect several per test. The question is always "Which choice completes the text so that it conforms to the conventions of Standard English?" so you have to look at the choices to see what is being tested.

What the questions look like

• Verb forms. The choices are one verb in different forms, such as "is," "are," "were," and "have been," or "measured," "measuring," "to measure," and "measures." You pick based on the subject, the time frame, and whether the sentence needs a main verb.
• Pronouns and possessives. The choices mix forms like "its," "it's," "their," and "they're," or "scientist's," "scientists'," and "scientists."
• Modifiers. The sentence starts with a descriptive phrase, and the choices offer different ways to finish it. The noun right after the comma must be the thing the phrase describes.

Step-by-step method

1. Look at the choices and name what varies: the verb form, the pronoun, the noun form, or the subject of the sentence.
2. For verbs, find the true subject. Mentally cross out prepositional phrases like "of the letters" and any nonessential clauses between the subject and the blank. Match a singular subject with a singular verb and a plural subject with a plural verb.
3. Check the tense against time clues in the passage, such as dates, "now," "last year," and the other verbs in the same sentence or paragraph.
4. Make sure the sentence has a main verb. Forms ending in "-ing" or starting with "to" can't serve as the main verb on their own.
5. For pronouns, find the noun the pronoun replaces and match its number. A singular noun like "company," "team," or "committee" takes "its," not "their."
6. For possessives, ask whether the noun owns the word that follows. For a single owner, add an apostrophe and s, as in "the scientist's notes." For plural owners ending in s, add only an apostrophe, as in "the scientists' notes." If nothing is owned, use the plain plural with no apostrophe.
7. For modifiers, ask who or what is doing the action in the opening phrase. That noun must come right after the comma.

Worked example

The collection of letters written by the explorer during her three expeditions ______ now housed in a university archive.

Which choice completes the text so that it conforms to the conventions of Standard English?

A) are
B) is
C) were
D) have been

Answer: B. Strip away "of letters written by the explorer during her three expeditions" and the sentence reads "The collection ______ now housed." "Collection" is singular, so it needs "is," and "now" confirms the present tense. Choices A, C, and D are plural verbs that agree with "letters" or "expeditions," the nouns closest to the blank.

Last year, a team of engineers ______ a roof paint that reflects most incoming sunlight.

Which choice completes the text so that it conforms to the conventions of Standard English?

A) developing
B) to develop
C) developed
D) having developed

Answer: C. The sentence has a subject, "a team of engineers," but no main verb unless the blank supplies one. "Developing," "to develop," and "having developed" can't act as main verbs on their own, so each would leave a fragment. "Developed" is a complete past-tense verb, and "last year" calls for the past tense.

Having studied the region's rainfall records for more than a decade, ______

Which choice completes the text so that it conforms to the conventions of Standard English?

A) the drought's early warning signs were obvious to the hydrologist.
B) the hydrologist recognized the drought's early warning signs.
C) the early warning signs of the drought were recognized by the hydrologist.
D) recognizing the drought's early warning signs was easy for the hydrologist.

Answer: B. The person who studied the records is the hydrologist, so "the hydrologist" must come right after the comma. In A and C, the sentence says the warning signs studied the records. In D, the opening phrase attaches to "recognizing," which can't study anything.

Common traps

• The nearest noun. The noun right before the blank is often not the subject. In the first example, "expeditions" sits next to the blank, but "collection" is the subject.
• Collective nouns. The SAT treats words like "team," "committee," "collection," and "family" as singular, as in "the committee is" and "the team announced its plan."
• Apostrophe mix-ups. "It's" always means "it is" or "it has," and the possessive is "its." In the same way, "their" shows possession, while "they're" means "they are."
• Fragments with long interruptions. In "The museum, which opened in 1902 and was expanded twice, ______ thousands of visitors each year," the blank needs a main verb like "attracts," not "attracting."
• Dangling modifiers that sound formal. Passive choices like C in the third example sound polished but still put the wrong noun after the comma.

Quick check

Say the subject and verb together with everything between them removed, like "the collection is" or "the team developed." If the pair sounds wrong on its own, the answer is wrong.