Mine, yours, his, hers, its, ours, theirs are the possessive pronouns used to substitute a noun and to show possession or ownership.
EG. This is your disk and that's mine. (Mine substitutes the word disk and shows that it belongs to me.)
See Also: Reflexive Pronoun; Possessive Adjective; Demonstrative Adjective; Negative Pronoun; Reciprocal Pronoun
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