This document discusses the present perfect and present perfect progressive tenses in English. [1] It explains how the present perfect is used to talk about indefinite past events and things that began in the past but continue to the present using "since" or "for". [2] It then explains how the present perfect progressive emphasizes ongoing or unfinished actions that began in the past, while the present perfect emphasizes completed results. [3] Examples are provided to illustrate the different uses of these tenses.