The document discusses the passive voice and provides examples of sentences written in both the active and passive voice. The passive voice emphasizes the object of the sentence rather than the subject by using a form of "to be" plus the past participle of the main verb. Some key points about the passive voice are that it emphasizes the object, uses verbs like "to be" in the desired tense, and changes the word order compared to the active voice. Several examples are given to illustrate transforming sentences from active to passive voice.