Page 123 - Perfect English Grammar: The Indispensable Guide to Excellent Writing and Speaking
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Pronouns are used in place of a specific noun mentioned earlier in a sentence,
so we don’t have to keep saying that specific noun and can say fewer syllables.
Personal pronouns are associated with a specific grammatical person form of a
verb.
The original noun is the antecedent. The pronoun is the referent; it refers
back to the original word. The antecedent and pronouns have to agree in number
and gender. See Subject-Verb Agreement, section 5.2.
