Bài 1: Bài tập về các thì 

1. am learning

2. wasn't worked, weren't be

3. will pass want

4. sent

5. is, think, learn 

6. have gone, haven't enjoy

9. am having, have had

10. am revising

11. have already began 

12. think, do

15. have gone

16. have seen can

Bài 2: Chọn đáp án đúng nhất

1. A

2. B

3. B

4. A

5. C

B1

1, am learning

2, wasn't worked / weren't be

3, will pass want

4, sent

5, is / think / learn 

6, have gone / haven't enjoy

9, am having / have had

10, am revising

11, have already begin 

12, think / do

15, have gone

16, have sen cân

b2

1, c - was living

2, B - haven't seen

3, B - left

4, A - has just painted

5, B - wass looking