The document discusses the use of verb forms to talk about the past, present, and future. It explains that the past perfect tense (had + past participle) is used in conditional statements, hypotheses, and wishes when referring to the past, such as "I would have helped him if he had asked" and "I wish I hadn't spent so much money last month." It also provides examples of using different verb tenses like the past simple and past continuous to talk about the past and present perfect to talk about the present or future. Links to additional resources on English verb tenses are included.