Các bạn ơi ! Giúp mình với

1. had been = > were

2. doing = > to do

3. Unless = > If

4. had I know = > I had known

5. had knew = > had known

6. had finished => finishes 

7. confident = > confidently

8. be lost = > have lost

9. would write = > would have written

10. would stop = > would have stopped 

11. had you sent = > you had sent 

12. was = > were 

13. will be sack = > will be sacked 

14. will = > would 

15. did not try = > doesn't try