Possessive adjectives indicate ownership or belonging and include my, your, his, her, its, our, and their. Pronouns are words that substitute for nouns and include I, you, he, she, it, we, they, who, whom, whose, myself, yourself, himself, herself, itself, ourselves, yourselves, and themselves. Possessive adjectives and pronouns are important parts of speech that help avoid repetition in writing and conversation.