Ответ:
I have been reading this book for three days.
We have been playing volleyball for twenty minutes.
She has been cleaning the flat for more than an hour.
Peter has been swimming for half an hour.
Anna has been speaking on the phone for an hour now.
You have been waiting for a bus for ten minutes only.
Nelly and Mary have been doing the shopping/since early morning.
It has been snowing since last night.
Jack and his friend have been riding bikes for three hours now.
The teacher has been explaining a grammar rule/since the beginning of the lesson.
Объяснение: