The document discusses the passive voice and how it is formed with a form of the verb "to be" and the past participle. It notes that the subject of a passive sentence is the object of the active voice equivalent. Some common uses of the passive voice are discussed, including when the agent is unknown, to emphasize the agent, and in formal writing like news reports. Open cloze exercises are also mentioned where a word is omitted and must be filled in based on the context.