The document discusses the causative structure in English. There are two basic causative structures - an active form and a passive form. In the active form, the subject causes an agent to perform an action on an object, following the pattern of "Subject causative verb Agent Action verb Object". In the passive form, there is usually no agent specified and the object precedes the past participle verb, following the pattern of "Subject causative verb Object Action verb". Common causative verbs like "have", "make", "get", and "let" can be used in these structures.