`-` Thì QKĐ:

`(+)` S+ Ved/ V2

`(-)` S+ did+ not+ V

`(?)` Did+ (not)+ S+ V+...`?`

`1`. went

`2`. played

`3`. ate

`4`. took

`5`. had

`6`. Didn't she buy

`7`. didn't talk

`8`. Didn't they come

`9`. Didn't the windows close

`10`. didn't return 

`11`. didn't eat

`12`. didn't go

`13`. didn't take

`14`. didn't have

`15`. Was Lan and Hoa

`16`. did they play

`17`. did Hoa try

`18`. talked

`19`. did they stop

`20`. did the students wear

1. Went

2. Played

3. Ate

4. Took

5. Had

6. Didnt she buy

7. Didnt talk

8. Didnt they come

9. Didnt the windows close

10. Didnt return

11. Didnt eat

12. Didnt go

13. Didnt take

14. Didnt have

15. Were Lan and Hoa

16. Did they play

17. Did Hoa try

18. Talked

19. Did they stop

20. Did thế students wear

- Thì QKĐ:

( + ) S + Ved/ V2

( - ) S + did + not + V

( ? ) Did + S + V...?