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     Pronoun is a function word that can be used as a substitute or replacement of a noun in a sentence. It is one of the part of speech.
    he, his, she, her, they, them, ... - Personal Pronouns
    this, these, that, those              - Demonstrative Pronouns
    themselves, ourselves, ...         - Reflective Pronouns
    someone, no one, few , ...         - Indefinite Pronouns
    whose, what, ...                        - Interrogative Pronouns
    who, which, ...                          - Relative Pronouns