The document discusses the present perfect tense in English. It defines the present perfect as a tense used to describe actions that occurred in the past but have relevance to the present. It notes the present perfect has three main uses: actions that happened at an unspecified time before now, actions that just occurred and still have visible results, and repeated actions between the past and present. The document also provides examples of forming the present perfect in the first, third and interrogative persons for affirmative, interrogative and negative sentences.