The document provides examples and explanations of using the past perfect tense in English. It begins by describing a situation where Sarah arrived at a party after Paul had already left. It then defines the past perfect as using "had" plus the past participle of the verb. It provides several examples of using the past perfect to talk about actions that occurred before another past time or event. It compares the past perfect to the past simple and present perfect tenses. Finally, it includes exercises for learners to practice forming sentences using the past perfect.