The document discusses active and passive voice in verbs. There are two types of voice: active voice and passive voice. Active voice shows that the subject performs the action, while passive voice shows that the subject receives the action. Active voice is more direct and concise, while passive voice is often wordier because it requires a helping verb and prepositional phrase. Passive voice can be identified by a helping verb and past participle, and may include a prepositional phrase beginning with "by" to indicate who performed the action. Passive voice is sometimes used to hide the subject or emphasize a different part of the message.