The document discusses active and passive voice in verbs. It explains that active voice shows the subject performing the action, while passive voice shows the subject receiving the action. It provides examples like "The dog chased the cat" in active versus "The cat was chased by the dog" in passive. The document also outlines rules for changing sentences from active to passive voice and vice versa. Finally, it gives more examples of changing sentences between active and passive voice in the present indefinite tense.