This document discusses the present perfect, past perfect, and future perfect verb tenses. It explains that the present perfect tense is used for actions that occurred at an unspecified time in the past or that have been repeated before now. It also notes that the past perfect tense refers to actions that occurred before a specific past time, while the future perfect tense expresses the idea that an action will occur before some future time. Formations of each tense are provided along with examples.