This document provides information on how to use the present perfect tense in English. It discusses three main uses of the present perfect tense: 1) to talk about experiences that have occurred, 2) to talk about actions that began in the past and continue in the present, and 3) to talk about past actions that have present results. It then explains how to form the present perfect tense and provides examples of positive, negative, and question sentences using the present perfect tense. It also discusses using "already", "yet", "for", and "since" with the present perfect tense.