The document discusses the passive voice in English. It begins by comparing the passive voice in English and Spanish. It then explains the structural changes that occur when changing from the active to the passive voice in English. Specifically, the subject becomes the object, the direct object becomes the subject, and the verb is changed to "to be" plus the past participle. The document provides examples of changing active voice sentences to the passive voice. It also discusses using the passive voice with complex sentences and the causative have construction.