Correct Subject Verb Agreement — Recognize and correct subject-verb agreement errors.

Historical Context & Motivation

The principle of subject-verb agreement is one of the oldest and most persistent grammatical conventions in the English language, rooted in the inflectional morphology that Indo-European languages inherited from their proto-linguistic ancestors. In Old English, verbs were heavily inflected, carrying distinct endings for first, second, and third person in both singular and plural forms—a system that demanded careful matching between the subject and its predicate. As the language evolved through the Middle English period, many of these inflections were lost through phonological simplification, yet the core requirement that a verb must agree with its subject in number survived as a fundamental syntactic constraint.

For aspiring educators preparing for the PRAXIS Core Writing exam, understanding subject-verb agreement extends beyond mere test preparation. As future teachers, you will be responsible for modeling correct standard written English and diagnosing student errors in agreement—errors that rank among the most common in student writing across all grade levels. The PRAXIS Core Writing (5723) exam specifically tests your ability to recognize and correct these errors in both selected-response and constructed-response contexts, making this skill both a gateway to licensure and a foundation of your professional practice.

The central question this lesson addresses is deceptively simple: how does a writer ensure that every verb form matches its subject in number and person, even when intervening phrases, inverted syntax, or compound structures obscure that relationship? On the PRAXIS exam, test-makers deliberately construct sentences with these complicating features to assess whether candidates can parse sentence structure accurately and apply agreement rules with confidence.

Core Principles of Subject-Verb Agreement

Subject-verb agreement in standard written English rests on a set of principles that, once internalized, allow writers and editors to navigate even the most syntactically complex sentences. The fundamental rule is straightforward: a singular subject requires a singular verb, and a plural subject requires a plural verb. However, the complexity arises from English sentence structures that separate subjects from verbs or present subjects in forms whose number is ambiguous.

Visual Explanation: Subject-Verb Agreement Decision Tree

The following decision-tree diagram provides a systematic approach to determining correct subject-verb agreement. When you encounter a PRAXIS question involving agreement, trace through the flowchart by first identifying the true subject, then determining its number, and finally selecting the corresponding verb form. This visual framework converts a complex linguistic judgment into a series of manageable binary decisions.

Notice that the decision tree places identifying the true subject as the very first step. This is intentional: the overwhelming majority of agreement errors on the PRAXIS exam stem from a misidentification of the subject, not from ignorance of the agreement rule itself. Test-makers frequently embed the subject within prepositional phrases, appositive constructions, or inverted sentence structures to test whether candidates can parse syntax accurately before applying the rule.

How Agreement Works: The Mechanism in Detail

The Grammatical Mechanics of Number Agreement

In standard written English, the agreement mechanism operates primarily in the present tense, where the third-person singular subject triggers an -s or -es inflection on the verb ("she runs," "it crashes"), while all other persons and the plural take the base form ("they run," "we crash"). The verb "to be" is the most irregular, carrying distinct agreement forms in both present tense (am, is, are) and past tense (was, were). Understanding this mechanism means recognizing that English agreement marking is asymmetric—it is overtly marked in limited contexts but must be maintained consistently in standard writing.

Pattern 1: Prepositional Phrase Interference

The most common PRAXIS trap involves placing a prepositional phrase between the subject and the verb, where the object of the preposition differs in number from the subject. Consider: "The collection of rare stamps was appraised yesterday." The subject is "collection" (singular), not "stamps" (plural). The phrase "of rare stamps" is a prepositional modifier and has no bearing on the verb form. You can mentally bracket or cross out the prepositional phrase—"The collection [of rare stamps] was appraised"—to verify agreement.

Pattern 2: Expletive Constructions (There/Here)

Sentences beginning with expletive "there" or "here" invert normal word order, placing the subject after the verb. In "There are many reasons to study grammar," the true subject is "reasons" (plural), which requires the plural verb "are." Conversely, "There is a compelling reason" uses the singular "is" because the subject "reason" is singular. On the PRAXIS, always look past the expletive to the noun that actually performs the action or exists.

Pattern 3: Indefinite Pronoun Agreement

Indefinite pronouns present a unique challenge because their number is not always intuitive. Pronouns like each, everyone, everybody, nobody, someone, either, neither are always singular and require singular verbs: "Each of the students has submitted a portfolio." Meanwhile, both, few, many, several are always plural: "Several of the proposals were rejected." The tricky group—all, any, most, none, some—takes its number from the noun in the prepositional phrase that follows: "Some of the water is contaminated" (singular, because water is uncountable) versus "Some of the reports are missing" (plural, because reports is countable and plural).

Pattern 4: Collective Nouns

A collective noun (team, committee, family, class, jury) is treated as singular when the group acts as a unit and plural when the individual members act separately. In American English, the singular treatment predominates: "The committee has reached its decision." However, when internal disagreement is emphasized, the plural may appear: "The committee have disagreed among themselves." For PRAXIS purposes, default to the singular interpretation unless the sentence context explicitly indicates individual member action.

Detailed Breakdown: Tricky Agreement Scenarios

Beyond the foundational patterns, the PRAXIS Core Writing exam frequently tests agreement in scenarios that even proficient writers find challenging. The diagram below maps these tricky cases along a spectrum from commonly tested to rarely tested, helping you prioritize your study time effectively.

Worked Example: Diagnosing and Correcting Agreement Errors

The following worked example mirrors the format of PRAXIS Core Writing selected-response questions. You will encounter a sentence with an underlined portion that may or may not contain an error. Your task is to identify whether the verb agrees with its subject and, if not, select the correct form.

Common Error Patterns vs. Correct Forms

Understanding where errors most frequently occur—and why even experienced writers make them—will sharpen your ability to diagnose agreement problems on the PRAXIS. The table below contrasts the most common error patterns with their corrections and the cognitive traps that produce them.

Connection to Advanced Grammar and Classroom Application

For teaching certification candidates, mastering subject-verb agreement has implications that extend well beyond test day. Once you enter the classroom, you will encounter students who speak varieties of English where agreement patterns differ from standard written English—a reality that demands both grammatical expertise and cultural sensitivity. Understanding the descriptive linguistics of agreement (how people actually speak) alongside the prescriptive conventions (what standardized tests expect) positions you to teach effectively without stigmatizing students' home languages.

Looking ahead, the evolving acceptance of singular "they" presents an interesting case study in how prescriptive grammar rules shift over time. Major style guides including APA (7th edition) and the Chicago Manual of Style (17th edition) now accept singular "they" as a gender-neutral pronoun, which introduces a tension between traditional agreement rules and inclusive language practices. For PRAXIS purposes, follow the exam's current prescriptive framework, but be prepared to navigate this evolving terrain in your professional work.

Practice Problems

The following five problems replicate the style and complexity of PRAXIS Core Writing agreement questions. For each, identify whether the sentence contains a subject-verb agreement error and, if so, state the correction. Difficulty escalates from conceptual recall through critical analysis.

Subject-Verb Agreement: Key Concepts Review