Câu 11:  have seen lots -> had seen lots

Câu 12: listen intently-> listening intently

Câu 13. change -> changed

Câu 14. is still-> was still

Câu 15. I'm shopping-> I was/were shopping

Câu 16. is having-> was having

Câu 17. are-> have been married

Câu 18. are believing-> believe

Câu 20. waking-> wakes

Câu 21. drives -> was driving
Câu 22. will certainly complete -> will have certainly completed
Câu 23. buys -> bought
Câu 24. We’ll be cycled -> We’ll be cycling
Câu 25. won’t come -> don’t come
Câu 26. was knocking -> knocked
Câu 27. didn’t drink -> hasn’t drunk

đúng r nha

Câu 7 sai 

offering=>offered

attractive=> attractively

likes and dislikes=>likes or dislikes

nobody =>anybody 

under=>in

supposing=>supposed

other=>rather

soon=>hurriedly 

so that=>so

under=>on

7.Therefore -> However

8. a -> bỏ a

9. annoying at -> annoyed at

He comes here by bicycle.

with chuyển thành by

thank you very much

...., theirs is bigger and ours is smaller.

They are Possevive pronouns.

hearing => to hear (mệnh đề quan hệ rút gọn)