The document discusses the active and passive voice in English grammar. It defines active and passive sentences, noting that the active voice has the subject performing the action while the passive voice has the subject receiving the action. It provides examples of when to use the passive voice, such as when the focus is on the action rather than the actor, or to be more polite. It also covers the formation of the passive voice using various helping verbs and the past participle, as well as some exceptions. Impersonal passive constructions and the uses of "have" and "get" something done are also briefly explained.