1. isn't

2. don't

3. were

4.has

5. like

6. can't

7. isn't

8. doesn't

9. will

10. haven't

11. isn't

12. am not

13. aren't

14. aren't

15. did

16. mustn't

17. needn't

18. don't

19 doesn't

20. isn't

Giải thích: 

Nếu vế 1 có dạng phủ định thì vế 2 sẽ ở dạng khẳng định và ngược lại

1. She is collecting seashells, (is/isn’t) she?

2. We often play soccer in the afternoon, (do/don’t) we?

3. You weren’t recognized, (were/ weren’t) you?

4. Your father (has/hasn’t) cleaned your bike, hasn’t he?

5. John and Jim (like/don’t like) scary movies, don’t they?

6. You (can/can’t) win this competition, can you?

7. She is watching TV downstairs, (isn’t/doesn’t) she?

8. The journey to the South cost a lot of money, (doesn’t/ didn’t) it?

9. You won’t lie to me, (will/do) you?

10. Josh and John have met each other, (haven’t/don’t) they?

11. She’s from a small town in Thailand, (doesn’t/isn’t)she?

12. I am intelligent, (amn’t / aren’t) I?

13. We’re late again, (/ aren’t) we?

14. They are going to France this summer, (aren’t/ don’t) they?

15. She didn’t use to work in a hotel, (did/does) she?

16. You must obey the rule, (don’t/mustn’t) you?

17. They need some new clothes, (needn’t/ don’t) they?

18. Jim and his wife live in a tiny flat, (doesn’t/ don’t) they?

19. Mary studies very hard every night, (doesn’t/ did) she?

20. This table is made wood, (isn’t/ doesn’t) it?

=> Subject + verb + (object) + …,  trợ động từ (aux) + subject/ đại từ tương ứng với subject ?