1 Jack has been studying all morning.
2 We have not been watching TV this evening.
3 How long have you been waiting?
4 I have been reading this book since yesterday.
5 Sarah has been talking on the phone for an hour.
1 Jack has been studying all morning.
2 We have not been watching TV this evening.
3 How long have you been waiting?
4 I have been reading this book since yesterday.
5 Sarah has been talking on the phone for an hour.