1)I have been reading this book for three days.
2)We have been playing volleyball for twenty minutes.
3)She has been cleaning the flat for more than an hour.
4)Peter has been swimming for half an hour.
5)You have been waiting for a bus for ten minutes only.
6)It has been snowing since last night.
7)Jack and his friends have been riding their bikes for three hours now.
8)The teacher has been explaining a grammar rule since the beginning of the lesson.
