Possessive adjectives are used to show ownership or possession and correspond to subject pronouns. The possessive adjectives are: my, your, his, her, its, our, your, their. The ending of the adjective changes to match whether the noun is plural or singular and the gender of the noun. Common mistakes include using an apostrophe with the possessive adjective "its" and confusing similar words like "there", "they're", and "their".