This document discusses the present perfect simple and present perfect continuous tenses in English. The present perfect simple is used to describe life experiences, events that have already happened or just happened, connections between past and present, durations of time, and amounts. The present perfect continuous emphasizes the duration of an action and is used with time expressions or to describe continuous actions that have recently finished. The key difference between the tenses is that the simple focuses on the result of an action while the continuous focuses on the duration.