The document discusses the passive voice in Spanish. It provides examples of changing sentences from active to passive voice. Key points covered include: 1. In the passive, the subject becomes the agent with "by" and the direct object becomes the subject. The main verb changes to the past participle. 2. Personal pronouns change in the passive (e.g. "I" becomes "me"). 3. Sentences with two objects can have either the direct or indirect object as the subject in the passive form. 4. Impersonal passives are formed with "it" as the subject and the verb "to be".