The document discusses the present perfect continuous tense in English. It provides the forms for the positive, question, and negative structures using the verbs "to be" and a main verb plus "-ing". It also gives examples of short answers and discusses the uses of the present perfect continuous tense, including to talk about actions that started in the past and are still ongoing, actions that recently stopped but still have present results, repeated actions, and with time expressions like "for" and "since".