=>
1. C
2. D
3. C
4. A
5. C
6. C
7. D
8. A
9. B
10. A
Các câu trên thuộc dạng câu điều kiện :
Câu điều kiện loại 1 : S + Vs/es....., S + will V
Câu điều kiện loại 2 : S + V2/ed....,S + would V

4/
1. were/wouldn't have
2. would be/had
3. were/would help
4. would you do/were
5. didn't lend/would die
6. would understand/spoke
7. would be/visited
8. would pass/had
9. would tell/asked
10. had known/would have visited.

1,were/wouldn't have
2,would be/had
3, were/would help
4,would you do/were
5,didn't lend/would die
6, would understand/spoke
7,would be/visited
8, would pass/had
9,would tell/asked
10,had known/would have visited