This document provides instruction on using the present perfect and present perfect continuous tenses in English. It outlines several uses of the present perfect, including for past experiences with no specific time reference, finished actions connected to the present, and expressions like "already" or "yet." It also discusses using the present perfect continuous for actions that started in the past and continue to the present, or actions that have just finished but have present results. The key difference between the present perfect and present perfect continuous is that the present perfect emphasizes completion of an action while the continuous emphasizes the continuation of an action.