The document discusses the past perfect tense and provides examples and exercises to practice forming and using the past perfect. It explains that the past perfect is used to talk about actions that occurred before something else in the past. Examples are given filling in past participles and completing sentences in the negative past perfect and as questions in the past perfect simple tense. The conclusion reiterates that the past perfect is used to indicate time accompanied by the past tense and conditional, and that "had" in this context is an auxiliary verb that must be used with a main verb.