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It takes the place of one or more nouns or pronouns.
What is a pronoun?
Examples: (first person singular) I, me, my, mine
(first person plural) we, us, our, ours
(second person singular/plural) you, your,
yours
(third person singular) he, him, his, she, her,
hers, it, its
(third person plural) they, them, their, theirs