Bài I, II, III, IV, V bạn tự áp dụng công thức chia động từ của các thì vào là OK.
Bài VI:
1. has been working / has worked
2. is studying - will be
3. did you learn - taught
4. had begun - arrived
5. does your sister do - reads - listens - watches
6. was - didn't go - stayed - did
7. got - were...