Fourth Grade English: Subject-Verb Agreement Rules
In a well-constructed sentence, the subject and the verb exist in harmonious partnership: they must agree in number. A singular subject demands a singular verb, while a plural subject requires a plural verb. While simple sentences like "The dog barks" and "The dogs bark" seem straightforward, subject-verb agreement becomes challenging when words intervene between the subject and verb, or when compound subjects are introduced. Mastering agreement rules ensures your writing remains grammatically flawless.
The Cardinal Rule of Agreement
The foundation of subject-verb agreement is matching the grammatical number of the subject to the form of the verb.
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| THE NUMBER MATCHING PRINCIPLE |
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| |
| SINGULAR SUBJECT =====> SINGULAR VERB (Ends in -s in present) |
| "The scientist discovers new bacteria." |
| |
| PLURAL SUBJECT =====> PLURAL VERB (No -s in present) |
| "The scientists discover new bacteria." |
| |
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The S-Ending Paradox
Notice a surprising difference between nouns and verbs in English:
- Nouns usually add "-s" to become PLURAL (one book -> two books).
- Verbs usually add "-s" to become SINGULAR in the present tense (he reads, she writes).
Therefore, if your subject has an "-s" ending, your verb will usually NOT have an "-s" ending, and vice versa!
Intervening Prepositional Phrases
The most frequent source of agreement errors occurs when a prepositional phrase separates the subject from its verb.
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| THE INTERVENING PHRASE TRAP |
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| Sentence: |
| "The box [of colorful crayons] (is / are) on the table." |
| |
| Trap: "crayons" is plural and sits right next to the verb! |
| Test: Cross out the prepositional phrase [of colorful crayons]: |
| "The box _______ on the table." |
| |
| Result: "The box IS on the table." (Singular subject = singular verb) |
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Finding the True Subject
Always locate the true subject of the sentence before choosing your verb. Words inside prepositional phrases (starting with of, in, on, at, with, between, for) can NEVER be the grammatical subject of the sentence.
- "The captain [of both soccer teams] leads the warm-up." (Subject is "captain," not "teams").
- "The players [on the field] run quickly." (Subject is "players," not "field").
Compound Subjects: Joined by "And" vs. "Or"
When two or more subjects are connected by coordinating conjunctions, specific agreement rules apply.
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| COMPOUND SUBJECT RULES |
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| Connector | Rule | Example |
+----------------+------------------------------+-----------------+
| AND | Always takes a PLURAL verb | Leo and Sam are |
| | (1 + 1 = 2) | ready. |
| | | |
| OR / NOR | Verb agrees with the subject | Either the cats |
| | CLOSEST to the verb | or the dog IS |
| | | barking. |
| | | Either the dog |
| | | or the cats ARE |
| | | barking. |
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Compound Subjects with "And"
Whenever two or more subjects are joined by "and," they form a plural unit, requiring a plural verb:
- "The doctor and the nurse review the chart."
- "A pencil and an eraser belong in your desk."
The Proximity Rule with "Or" and "Nor"
When subjects are joined by "or" or "nor," look only at the subject noun that is immediately next to the verb:
- "Neither the coach nor the players were satisfied with the score." ("Players" is plural and closest to the verb).
- "Neither the players nor the coach was satisfied with the score." ("Coach" is singular and closest to the verb).
Special Subjects: Indefinite Pronouns and Collective Nouns
Certain subjects require extra attention because their form can be misleading.
Singular Indefinite Pronouns
Indefinite pronouns like everyone, everybody, someone, nobody, each, either, and neither are grammatically singular:
- "Everyone in the auditorium holds a program."
- "Each of the apples is ripe." (Do not be fooled by the plural "apples" in the prepositional phrase).
Here and There Inversions
In sentences beginning with "here" or "there," the words "here" and "there" are never the subjects. The true subject comes AFTER the verb:
- "There is a robin in the tree." (Subject is "robin" -> singular "is").
- "There are three robins in the tree." (Subject is "robins" -> plural "are").
Practice Exercises
Practice Questions
- Choose the correct verb: "The basket of ripe strawberries (sits / sit) on the kitchen counter."
- Choose the correct verb: "Marcus and his brother (plays / play) the cello in the orchestra."
- Choose the correct verb: "Neither the rain nor the howling winds (stops / stop) the lighthouse keeper."
- Choose the correct verb: "Each of the students (receives / receive) a certificate of achievement."
- Choose the correct verb: "There (is / are) several interesting artifacts in the museum exhibit."
Answer Key and Explanations
- Correct verb: "sits." The true subject is the singular noun "basket." The plural noun "strawberries" is inside the prepositional phrase "of ripe strawberries."
- Correct verb: "play." Compound subjects joined by "and" are plural.
- Correct verb: "stop." When subjects are joined by "nor," the verb agrees with the closer subject ("winds," which is plural).
- Correct verb: "receives." "Each" is a singular indefinite pronoun requiring a singular verb.
- Correct verb: "are." In inverted "there" sentences, the subject follows the verb. Here, the subject is the plural noun "artifacts."