The document discusses the passive voice in English grammar. It defines the passive voice as constructing sentences where the subject is acted upon by the verb rather than performing the action. It provides examples of passive voice constructions using different tenses, such as the present continuous passive and past continuous passive. The forms involve using some form of "to be" plus the past participle of the main verb. The document also notes that passive voice is used when the actor is unknown or less important than the action itself.