This document compares and contrasts the present perfect continuous and present perfect simple tenses in English. It provides examples of when to use each, noting that the continuous form is used for actions happening over a period of time, while the simple form is used for completed actions. It also discusses how duration is expressed differently with each form. Some state verbs like "know" cannot take the continuous form. The document concludes with exercises asking readers to choose the appropriate tense in different situations.