III.
1. have you been studying/ have been learning
2. have been waiting/hasn't come
3. have lost/ have you seen/ have just seen
4. have you been working/ have been studying
5. have you seen/ haven't seen/ has lived
6. have been doing/ have finished
7. has left/ has been cleaning/ has finished
8. have been working/ have done
9. have heard/ have you done
10. have you been reading/ have been reading/ haven't finished
11. have you known/ have known
12. Has John always lived/ has lived
IV.
1. think/ is knocking
2. haven't known/ hasn't spoken
3. circles
4. are you staring/ haven't seen
5. have you seen
6. play
7. is increasing
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