tìm lỗi sai và sữa lại 

`7,` worked `->` have worked 

`8,` ate `->` has eaten

`9,` has eaten `->` ate 

`10,` finished `->` hasn't finished 

----

`@` Giải thích . cấu trúc:

HTHT (DHNB:for + khoảng thời gian)

S  + has/have  (not) + V-pp +O

------------------

*không hiểu thì hỏi nhé

Hiện tại hoàn thành : 

( + ) S + have / has + PII 

(  - ) S + have / has + not + PII 

(  ? ) Have / Has + S + PII ? 

`@` has not = hasn't 

`@` have not = haven't 

_  _ _ __ _ _ _ _ _ _ _ _ _  _ _ _  _

`7` ) worked `=>` have worked 

`8` ) ate `=>` has eaten 

`9` ) has eaten `=>` ate

`10` ) finished `=>` hasn't finished 

 @vibimaibeng .