Present Perfect Continuous
(have/has + been + infinitive + -ing)
When do you use it?
1. actions beginning in the past and still continuing (focus is on the action) – mostly with since (point of time) or for (period of time)
2. recently completed actions (focus is on the action)
Signal words: all day, the whole day, since, for, questions with how long
1. She has been writing for two hours.
2. I have been walking all afternoon, so my legs are dead.