This document discusses the present perfect continuous tense in English. It provides examples of how to form the present perfect continuous in the affirmative, negative, and interrogative. It explains that the present perfect continuous is used to emphasize how long something has been happening or actions that started in the past and are still continuing. It also discusses using the present perfect continuous to talk about new developments that may be temporary, as well as using it to talk about a recent continuous activity when the result can be seen. The document notes that stative verbs are not used in the present perfect continuous.
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