Free GMAT Course > Sentence Correction > Seven Error Types > 1. Subject-Verb Agreement > A. Introduction
Subjects and verbs must agree. Singular subjects must be paired with singular verbs, and plural subjects with plural verbs. Agreement allows us to show who’s doing what in a sentence by indicating which parts of the sentence go together.
Singular verbs generally have an “s” at the end. Plural verbs do not. Nouns are the opposite:
John (singular noun) walks (singular verb)
Cars (plural noun) drive (plural verb)
Pronouns must match their verbs as well.
He walks
They drive
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