This document discusses the semantics and uses of the present perfect tense in English. It explains that the present perfect indicates a past event or situation that has current relevance or significance. It provides examples of how the present perfect is used to refer to a resultant state, an experiential perfect describing past experiences, a persistent situation continuing to the present, and a very recent past. It notes that specific time adverbials are generally incompatible with the semantics of the present perfect.