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Master subject-verb and pronoun-antecedent agreement to eliminate common ACT English errors.
The rules of grammatical agreement are not arbitrary inventions dreamed up to torment students — they evolved over centuries to make written communication clear and unambiguous. When a subject and its verb "agree," or when a pronoun matches its antecedent, readers can follow the meaning of a sentence without stumbling. English inherited these conventions from older languages like Latin and Old English, both of which relied heavily on word endings to signal relationships between parts of a sentence.
Understanding how agreement rules developed helps you see why the ACT tests them so frequently. These rules exist because breaking them genuinely confuses readers. On the ACT English section, roughly 10–15% of questions test some form of agreement, making it one of the highest-yield topics you can study.
The central question that agreement addresses is simple: How do we ensure every part of a sentence works together so the reader always knows who is doing what? When agreement breaks down, ambiguity creeps in, and that is exactly the kind of error the ACT expects you to catch.
Agreement on the ACT comes in two main flavors: subject-verb agreement and pronoun-antecedent agreement. Both follow the same underlying logic — matched parts of a sentence must share the same number (singular or plural) and, in the case of pronouns, the same person and gender. Mastering a handful of core principles will allow you to handle nearly every agreement question the ACT throws at you.
The flowchart above is your go-to strategy for every subject-verb agreement question on the ACT. The test-makers deliberately insert intervening phrases — prepositional phrases, relative clauses, and appositives — between the subject and the verb. Your job is to mentally "cross out" those distractors so you can see the core subject-verb pair clearly. For example, in the sentence "The collection of rare stamps is valuable," the subject is "collection" (singular), not "stamps." The phrase "of rare stamps" is just an intervening prepositional phrase.
Basic subject-verb agreement is straightforward — "The cat sits" versus "The cats sit." Where the ACT catches students is in the tricky cases, so let's dive into each one.
Certain indefinite pronouns always take singular verbs, even though they seem to refer to multiple people. The SANAM group — Some, Any, None, All, Most — can be singular or plural depending on what follows them. "Some of the cake is gone" (cake is singular) versus "Some of the cookies are gone" (cookies is plural). However, words like "each," "every," "everyone," "everybody," "nobody," "neither," and "either" are always singular.
When subjects are joined by "or" or "nor", the verb agrees with the subject nearest to it. Consider: "Neither the players nor the coach was satisfied." Here "coach" is nearest and singular, so the verb is singular. If you flip it — "Neither the coach nor the players were satisfied" — "players" is nearest and plural, so the verb becomes plural.
The second major category is pronoun-antecedent agreement. An antecedent is the noun a pronoun refers back to. A pronoun must agree with its antecedent in number (singular/plural) and person (first/second/third). The ACT frequently tests whether a pronoun clearly and correctly matches. For instance, "Every student should open his or her textbook" is correct in formal ACT style because "every student" is singular. The ACT also tests for ambiguous pronoun reference — where a pronoun could refer to more than one noun, creating confusion.
| Error Type | Example (Incorrect) | Corrected Version |
|---|---|---|
| Intervening Phrase | The results of the experiment shows a clear trend. | The results of the experiment show a clear trend. |
| Indefinite Pronoun | Each of the musicians have a solo. | Each of the musicians has a solo. |
| Compound (or/nor) | Neither the coach nor the players was happy. | Neither the coach nor the players were happy. |
| Pronoun Number | Every student must complete their assignment. | Every student must complete his or her assignment. |
| Ambiguous Reference | When Sarah met Anna, she was nervous. | When Sarah met Anna, Sarah was nervous. |
Let's walk through an ACT-style passage question step by step to see how you'd apply the agreement principles in a real testing scenario.
| ACT Trap | Why It Fools You | Your Counter-Strategy |
|---|---|---|
| Long intervening phrase | A plural noun buried between a singular subject and its verb makes the singular subject "feel" plural. | Cross out everything between the subject and verb. Read the stripped sentence aloud. |
| Inverted sentence order | Sentences starting with "There is/are" or "Here is/are" put the subject AFTER the verb, so you might not check it. | Flip the sentence: "There are many reasons" → "Many reasons are there." Now identify the real subject. |
| Collective nouns | Words like "team," "committee," "group" refer to multiple people but are grammatically singular. | On the ACT, collective nouns are almost always treated as singular. Use singular verbs unless the sentence clearly refers to individual members acting separately. |
| "Each" and "every" | "Each of the players" sounds plural because of "players," but "each" is the actual subject. | Remember: "each" and "every" are ALWAYS singular, no matter what follows them. |
| Pronoun shift | A passage uses "one" and then switches to "you" or "they" mid-paragraph. | Check that the pronoun person stays consistent. If the passage starts with "one," it should stay with "one" (or "he or she"). |
Agreement isn't just an ACT concept — it's a foundational skill that appears across virtually every standardized test and in all college-level writing. Understanding how the ACT tests agreement prepares you for similar questions on the SAT, AP English Language, and even the writing sections of graduate school entrance exams.
| Feature | ACT English | SAT Writing | College Writing |
|---|---|---|---|
| Format | Passages with underlined portions; 4 answer choices | Similar passage-based format; 4 answer choices | Your own essays and papers, graded by professors |
| S-V Agreement | Frequently tested with intervening phrases and indefinite pronouns | Same error types; slightly different passage style | Expected to be flawless; errors lower your grade |
| Pronoun Agreement | Tests number, person, and ambiguity | Same core rules tested | Conventions may evolve (e.g., singular "they" increasingly accepted) |
| Singular "they" | Generally treated as incorrect for indefinite singular antecedents | Similar conservative approach | Increasingly accepted in academic and professional writing |
It's worth noting that language is always evolving. In everyday speech and increasingly in formal writing, singular "they" is becoming widely accepted (e.g., "Each student should bring their textbook"). However, for the purposes of the ACT and SAT, you should follow the more traditional rule: a singular indefinite pronoun takes a singular pronoun ("his or her") unless the answer choices make it clear that the test is accepting "they." When in doubt on standardized tests, the most formal option is usually the safest choice.
Try these five problems, which move from basic recall to critical thinking. For each one, identify the agreement error (if any) and select the correct option. Then check the answer to see if your reasoning matches.
Agreement is one of the most frequently tested conventions on the ACT English section and comes in two main forms. Subject-verb agreement requires that a singular subject takes a singular verb and a plural subject takes a plural verb. The ACT makes this tricky by inserting intervening phrases (prepositional phrases, relative clauses, appositives) between the subject and verb, by using indefinite pronouns like "each" and "everyone" that look plural but are singular, and by presenting inverted sentences where the subject comes after the verb.
Pronoun-antecedent agreement requires that every pronoun matches its antecedent in number and person. Watch out for ambiguous pronoun references (where a pronoun could refer to more than one noun) and for number mismatches (using "their" to refer to a singular antecedent). Your core strategy for every agreement question is the same: find the verb or pronoun, trace back to its subject or antecedent, cross out any distractors in between, and confirm that they match in number. This systematic approach will help you confidently answer agreement questions on test day.