12. have found

13. has he spent

14. have answered 

15. hasn't talked

16. Have you lost

17. has your mother baked

18. Has he ever been

19. haven't received 

20. have you been

*GT: - Cấu trúc HTHT:

+) S + have/has + VII

-) S + have/has not + VII

?) Have/Has + S + VII?

`-` Thì HTHT :

`+` KĐ : S + have / has + VpII

`+` PĐ : S + haven't / hasn't + VpII

`+` NV : Have / Has + S + VpII ?

`=>` `DHNB` : since , for , already , since , so far , ...

`=>` 

`+` I , You , We , They `+` have

`+` He , She , It `+` has

`12`.have found

`13`.has ... spent ?

`14`.have answered

`15`.hasn't talked to

`16`.Have ... losed ?

`17`.has ... baked ?

`18`.Has ... been ?

`19`.haven't received

`20`.have ... been ?

`\text{# TF}`