The document discusses active and passive voice in the past tense. It explains that active voice has the subject performing the action, while passive voice has the subject receiving the action. It then provides examples of sentences in the active and passive voice in three past tenses: past indefinite tense, past progressive tense, and past perfect tense. For each tense, it shows affirmative, negative, and interrogative examples in both active and passive voice, and provides additional examples to illustrate the differences.