Final answer:
Pronoun case refers to the grammatical function of the pronoun. Subjective case pronouns are used as subjects, objective case pronouns as objects, and possessive case pronouns show ownership.
Step-by-step explanation:
Pronoun case refers to the grammatical function of the pronoun in a sentence. Pronouns that are the subjects of a sentence are written in the subjective case. Pronouns that are objects of a sentence or preposition are written in the objective case. Lastly, possessive pronouns show ownership and are written in the possessive case.
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