The document discusses the use of the present perfect tense in English. It explains that the present perfect is used to talk about past events or actions that have relevance to the present. It provides examples of using the present perfect with time words like "just", "already", and "yet". The document also compares the present perfect to the past simple tense, noting that the present perfect emphasizes the present result or relevance of a past event while the past simple simply places an event in the past without connecting it to the present. It outlines the structure of the present perfect and present perfect progressive tenses.