Put the verbs in brackets into the Present Perfect Continuous Tense.
1. Sam ____________ (to play) chess since half past four.
2. How long __________ (John/to train) for the competition?
3. Where ____________ (he/to go in for sport) since then?
4. Mary ____________ (to run) for two hours.
5. Michael __________ (to work) as a coach since 2010.
6. The children _________ (to play) outside for too long.
7. He ___________ (to do) the homework since he arrived home.