The document discusses the present perfect tense in English. It explains that the present perfect is used to talk about past events that occurred at an indefinite time or that have relevance to the present. It provides examples of using the present perfect to talk about life experiences, and contrasts it with the past simple tense. The document also discusses using the present perfect to give news, and the words just, already and yet in the present perfect. It concludes by explaining the difference between using for and since with the present perfect.