The document discusses the causative structure in English using "have" and "get". It explains that the causative structure is used to say that someone asks another person to do something. It provides examples of the active and passive causative forms and how "have", "get", and "make" are used differently to indicate asking, persuading, or forcing another to do something. Finally, it discusses how the causative structure is used in different tenses, interrogative/imperative forms, and additional constructions involving modals or "need" and "want".