The document discusses the passive voice. It defines passive voice as when the subject receives the action of the verb, as opposed to active voice where the subject performs the action. It provides examples of active and passive sentences. It describes the structure of passive voice as subject + auxiliary verb (be) + main verb (past participle). It discusses some reasons for using passive voice such as focusing on what is done to something rather than by something, avoiding mentioning the doer, or concealing information about the doer.