This document discusses the difference between active and passive voice in sentences. In active voice, the subject performs the action, while in passive voice, the subject receives the action. Some key points: - Active voice is more common and direct, while passive voice places more importance on the object. - To change from active to passive voice, the object becomes the subject and the subject often becomes introduced by "by". - Passive voice is used when the object/recipient of the action is more important or when the subject performing the action is unknown.