Since when have you been studying at this school?

1. he has been talking on the phone for 20 minutes.

2. i have been waiting for my friend for an hour.

3. it has been raining for 3 hours.

4. bob has been sitting in the waiting room since morning.

5. i have been trying to learn greek for 2 years.

6. he has been learning to drive for one month.

7. they have been quarrelling for 4 days.

8. the baby has been crying since morning.

9. i have been living in the centre since the start of the year.

10. he has been listening to his favorite music for 3 hours.

11. jack has been doing nothing for 4 years.

12. the parents have been watching tv since 5 o’clock.

13. father has been sleeping in his armchair for 45 minutes.

14. jane has been walking with her dog since 11 o’clock.

15. the teacher has been correcting our papers for 5 hours.

16. my sister his been looking for a pair of new  shoes  for 5 hours.