pronoun, in English, the part of speech used as a substitute for an antecedent noun that is clearly understood, and with which it agrees in person, number, and gender. In English the pronouns are classified as personal ( I, we, you, thou, he, she, it, they ), demonstrative ( this, these, that, those ), relative ( who, which, that, as ), indefinite (e.g., each, all, everyone, either, one, both, any, such, somebody ), interrogative ( who, which, what ), possessive, sometimes termed possessive adjectives ( my, your, his, her, our, their ), and reflexive (e.g., myself, herself ). The case of the pronoun depends upon its function in the sentence structure.
