A pronoun and its antecedent must agree in 2. number, gender, and person.
This refers to the part of speech that is used in a sentence, in the place of a noun and some examples include: He, she, theirs, ours, etc.
Hence, we can see that when using a sentence, the pronoun and its antecedents must agree in 2. number, gender, and person as this is a rule of concord in English grammar.
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