Chương 34. Bài Tập (Exercises) (tr.506)

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/ has been living
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 been doing - have done
10. have you been reading - have been reading - haven't finished
11. Have you known - have known
12. Has John always lived - has been living