Make a question with how long: They have been taking dance classes for 2 weeks.
How long have they been taking dance classes?
Complete: She ______ (play) ______ (for or since) she was four years old.
She has been palying the violin since she was four years old.
Complete: We _______ (talk) on the phone ______ (for or since) more than an hour.
We have been talking on the phone for more than an hour.
Complete: I ______ (wait) for you ______ (for or since) noon.
I have been waiting for you since noon.
Complete: He ______ (sing) the same song _____ (for or since) the last hour.
He has been singing the same song for the last hour.
