This document discusses indefinite pronouns in English. It provides examples of different types of indefinite pronouns including singular, plural, and pronouns that can be either singular or plural. Some common indefinite pronouns are anybody, anyone, anything, everybody, everyone, everything, nobody, no one, nothing, one, other, somebody, someone, something. The document also discusses interrogative pronouns such as who, whom, whose, which, and what and provides examples of their usage.