Subject–Verb Agreement

American Diploma › Digital SAT Reading and Writing — Complete Course

Subject–verb agreement is the most frequently tested grammar rule in the Form, Structure, and Sense part of the Digital SAT. The rule itself is short — a singular subject takes a singular verb and a plural subject takes a plural verb — but the test hides the subject so well that strong students still lose points. This page teaches you how to find the true subject every time, lists every tricky subject the test likes, and then trains you with worked examples and a 12-question quiz.

What this question type tests

Subject–verb agreement belongs to the Standard English Conventions domain, which is about 26% of the scored Reading and Writing questions (about 11–15 questions across the two modules). Inside that domain, the skill is called Form, Structure, and Sense, together with pronouns, verb tense, finiteness, modifiers and plural/possessive nouns. These questions usually come after the Information and Ideas questions in each module.

Every question has one short passage (25–150 words) with a blank, and the stem is always the same: "Which choice completes the text so that it conforms to the conventions of Standard English?" You can recognise an agreement question in two seconds by looking at the choices: they are the same verb in different forms, for example:

• is / are / was / were
• show / shows / have shown / has shown
• provides / provide / are providing / has provided

When two choices are singular and two are plural, the question is mainly about agreement. When the choices also change tense (has / had / will), you must check the tense as well — see the page on Verb Tense, Aspect and Finiteness. Often one step removes two choices (wrong number) and the second step removes one more (wrong tense).

The basic rule — and the "-s" confusion

In the present tense, a singular subject (he, she, it, one thing) takes a verb with -s; a plural subject (they, two or more things) takes a verb without -s. This is the opposite of nouns, where -s usually means plural. Students who are not native speakers often mix this up, so learn the table.

Only these forms change with number: present simple (-s), is/are, was/were, has/have, does/do. The simple past of normal verbs (studied, showed) and modal verbs (can, will, must) are the same for singular and plural — so a past-tense or modal choice is never wrong because of agreement alone.

Step 1: Find the true subject

Ask: "Who or what does the action of this verb?" Then remove everything that is not the subject. The test usually puts one of these between the subject and the verb:

After crossing out, read the skeleton sentence: subject + verb + rest. "The collection [of rare coins found in the tomb] is …" The skeleton must sound right on its own.

Step 2: Know the tricky subjects

Once you have the subject, check whether it is one of the special cases below. Each one appears regularly on the test.

Step 3: Plural words from Latin and Greek

Science passages love these words. Their plural does not end in -s, so students think they are singular. Learn both columns.

A note on data: in everyday English many people say "the data is", but formal scientific writing treats data as plural. A well-made question will not depend on "data is" versus "data are" alone, but if a passage already treats data as plural ("these data"), keep it plural. Words like phenomena, criteria and bacteria are always plural.

Step 4: Inverted sentences — the subject comes after the verb

Sometimes the verb comes before its subject. The SAT uses three patterns. In each one, find the noun after the verb and turn the sentence around in your head.

Step 5: Relative clauses — agree with the noun before "who / which / that"

The verb inside a relative clause agrees with the noun the pronoun refers to. "The wells that supply the village are old." Here that supply agrees with *wells*, and the main verb are also agrees with *wells*. Check both verbs separately.

The 6-step method for test day

1. Read the choices first. Same verb, singular vs plural? It is an agreement question.
2. Find the verb's subject. Ask "Who or what ___?" Do not trust the nearest noun.
3. Cross out prepositional phrases, extra information between commas or dashes, relative clauses, and "as well as" phrases.
4. Check the special list: each/every/neither, either…or, collective nouns, the number of / a number of, Latin plurals, -ing subjects, inverted sentences.
5. Eliminate the two choices with the wrong number. Then choose between the remaining two by tense: match the time clues and the other verbs in the passage.
6. Read the skeleton sentence (subject + chosen verb) once to confirm.

Worked examples

Worked example 1: the long subject

Passage: "The ancient trade routes of the Sahara, which connected salt mines in the north with gold-producing regions in the south, ______ for far more than the exchange of goods. Historians note that ideas, languages, and religious practices also traveled along them."

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

• A) was responsible
• B) is responsible
• C) were responsible
• D) has been responsible

Answer: C) were responsible. Cross out the prepositional phrase "of the Sahara" and the relative clause "which connected … in the south". The skeleton is "The routes … were responsible" — plural. The routes are historical and the passage uses past tense ("traveled"), so the plural past form is correct.

• A) was responsible — Nearest-noun trap: singular, as if the subject were "the south" or "the Sahara".
• B) is responsible — Singular, and present tense does not fit the historical context.
• D) has been responsible — Singular "has"; the subject "routes" needs "have".

Worked example 2: neither … nor

Passage: "Nobody knows why the eastern arch of the old stone bridge is lower than the western one. Neither the original architect nor the engineers who later restored the bridge ______ any written record explaining the difference."

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

• A) has left
• B) have left
• C) leaves
• D) was leaving

Answer: B) have left. With neither … nor, the verb agrees with the subject closer to it. The closer subject is "the engineers" (plural), so the verb must be plural: "have left". (Cross out "who later restored the bridge" first.)

• A) has left — Agrees with "architect", the farther subject. Neither…nor follows the closer subject.
• C) leaves — Singular, and present simple does not fit a finished action in the past.
• D) was leaving — Singular "was", and the progressive form makes no sense for leaving a record.

Worked example 3: the number of

Passage: "In the Fayoum Oasis, a small team of bird researchers has counted migratory birds at Lake Qarun every winter since 2015. The number of species recorded at the lake ______ grown steadily, a trend the researchers link to cleaner water."

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

• A) have
• B) has
• C) are
• D) were

Answer: B) has. The number of + plural noun is singular: the subject is "number", not "species". The time clue "since 2015" and the word "grown" need the present perfect: "has grown".

• A) have — Plural — the classic trap of agreeing with "species".
• C) are — "Are grown" is a passive form that changes the meaning, and it is plural.
• D) were — Plural, and "were grown" is passive past — it does not fit "since 2015".

Worked example 4: inverted sentence

Passage: "Divers surveying coral reefs in the Red Sea found that many colonies had lost their color after a hot summer. Among the most surprising results of the survey ______ several healthy colonies near the Gulf of Aqaba that seemed to resist the heat."

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

• A) was
• B) is
• C) has been
• D) were

Answer: D) were. The sentence is inverted. Turn it around: "Several healthy colonies … were among the most surprising results." The subject is "colonies" (plural), and the passage is in the past ("found", "had lost"), so "were" is correct.

• A) was — Singular. The trap is treating "the survey" (the nearest noun, singular) as the subject.
• B) is — Singular and present tense.
• C) has been — Singular "has".

Practice

Twelve original test-style questions. Use the 6-step method on each one. At the end you will see your score, the correct answers and an explanation for every question.

All pages in this course

Start here

• The Digital SAT: Complete Overview
• Time Strategy and How to Attack Every Question

Craft and Structure

• Words in Context
• High-Value Vocabulary for SAT Reading and Writing
• Text Structure and Purpose
• Cross-Text Connections

Information and Ideas

• Central Ideas and Details
• Command of Evidence: Textual
• Command of Evidence: Quantitative
• Inferences

Standard English Conventions

• Sentence Boundaries
• Commas and Extra Information
• Colons, Dashes and Semicolons
• Subject–Verb Agreement
• Pronouns
• Verb Tense, Aspect and Finiteness
• Modifiers, Parallel Structure and Comparisons
• Plurals and Possessives

Expression of Ideas

• Transitions
• Rhetorical Synthesis (Student Notes)

Full practice tests

• Digital SAT Reading and Writing — Practice Test 1
• Digital SAT Reading and Writing — Practice Test 2
• Digital SAT Reading and Writing — Practice Test 3