The document discusses the perfect tenses in English - the present perfect, past perfect, and future perfect. It provides examples of how to form each tense using auxiliary verbs and past participles. It also explains the uses of each tense, such as denoting completed actions connected to the present (present perfect), actions completed before a past time (past perfect), and actions that will be completed before a future time (future perfect). Exercises are provided to practice forming sentences using these tenses.