Ex.3
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.
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Ex.3
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.