The document provides an overview of the present perfect tense in English. It discusses 7 different functions of the present perfect tense: 1) when the time period has not finished, 2) when the time is not mentioned, 3) when the time is recent, 4) for states beginning in the past and continuing, 5) with for and since to indicate duration, 6) when talking about a past action with present results, and 7) when used with just, already, and yet for past actions with present results. It then provides examples of each function and includes a practice section with fill-in-the-blank and multiple choice questions about using the present perfect tense correctly.