Causative verbs indicate that one person causes a second person to do something. The document discusses the causative verbs have, get, make, and let. Have/get can be used in active and passive forms, with have/get followed by a verb in simple or past participle form. Make is stronger and means force, followed by a verb in simple form. Let means allow and is also followed by a verb in simple form. Examples of how to use each causative verb in different tenses are provided.