The document discusses active and passive voice in English grammar. It defines active voice as having the subject perform the action of the verb, while passive voice has the subject receive the action. Passive voice is formed using a form of the auxiliary verb "be" and the past participle. The document provides examples of passive voice constructions in different tenses and notes some common reasons to use passive voice over active, such as when the agent is unknown, not the focus, or obvious from context. It also discusses how to convert a passive sentence to active voice.