Pronouns must agree in number with their antecedents: singular nouns must take singular pronouns, and plural nouns must take plural pronouns.

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Pronoun-antecedent agreement is a grammatical rule stating that pronouns must agree in number (and gender, where applicable) with their antecedents, meaning singular nouns require singular pronouns and plural nouns require plural pronouns.

Pronouns Must Agree in Number with Their Antecedents: Singular Nouns