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A pronoun is a word which can be used instead of a noun. We use pronouns very often, especially so that we do not have to keep on repeating a noun.
Like nouns, personal pronouns sometimes have singular and plural forms (I-we, he-they).
Person is used here as a grammar word and means:
1st person or the self (I, me, we),
2nd person or the person spoken to (you),
3rd person or the person spoken about (he, she, him, her, they, them).