1. I have been reading this book for three days.
I have not been reading this book for three days.
Have I been reading this book for three days?
2. We have been playing volleyball for twenty minutes.
We have not been playing volleyball for twenty minutes.
Have we been playing volleyball for twenty minutes?
3. She has been cleaning the flat for more than an hour.
She has not been cleaning the flat for more than an hour.
Has she been cleaning the flat for more than an hour?
4. Peter has been swimming for half an hour.
Peter has not been swimming for half an hour.
Has Peter been swimming for half an hour?
5. Ann has been speaking on the phone for an hour now.
Ann has not been speaking on the phone for an hour now.
Has Ann been speaking on the phone for an hour now?
6. You have been waiting for a bus for ten minutes only.
You have not been waiting for a bus for ten minutes only.
Have you been waiting for a bus for ten minutes only.