01) I have been waiting for you since three p.m.
02) You have been studying English since last month.
03) He has been shopping since 10 a.m.
04) She has been sleeping since 6 p.m.
05) We have been ironing your dresses since yesterday.
06) You have been sitting here for twenty minutes.
07) They have been doing up for one hour.
08) I have been reading this book for a few days.
09) You have been doing sport for two months.
10) He has been running for forty-five minutes.