11. Her grandfather (die) 20 years ago. She (never meet) him. 12. Linh's brother (lose) his job last month and since then he (be) out of work. 13. You (see) Mrs Chi lately?- yes. I (see) her at the school gate three days ago. 14. The door won't open unless you (push) it hard. 15. As soon as I (have) enough money, I'll buy a new car. 16. I (not use) the car this evening, so you can have it. 17. I (walk) along the street when I suddenly (feel) something hit me in the back. I (not know) what it was.

`11`, died - has never met

`-` Vế `1`, DHNB : ago -> chia TQKĐ

`-` Vế `2`, DHNB : never -> chia THTHT

`12`, lost - has been

`-` Vế `1` , DHNB : last -> chia TQKĐ

`-` Vế `2`, DHNB : since -> chia THTHT

`13`, Have you seen - saw

`-` Vế `1`, DHNB : lately -> chia THTHT

`-` Vế `2`, DHNB : ago -> chia TQKĐ

`14`, push

`-` Unless = If ..not : nếu không thì

`-` Câu điều kiện loại `1`:  If  + S+  Vhtđ, S + will/can + V

`15`, have

`-` Sự hòa hợp giữa các thì : Thì tương lai thường đi cùng với thì hiện tại đơn ( tương lai đi với hiện tại)

`16`, am not using

`-` DHNB:  this evening -> chia THTTD

`-` Cấu trúc câu khẳng định : S +  am/is/are+  V-ing

`17`, was walking - felt - didn't know

`-` Cấu trúc : When + TQKĐ, TQKTD.

`-` Cấu trúc TQKTD dạng khẳng định : S + was/were + V-ing

`--------------`

Cấu trúc :

`+` TQKĐ :

`+)` S + Ved/V2

`-)` S+ didn't+  V

`?)` Did +S+ V

`+` THTHT :

`+)` S + have/has +P2

`-)` S +haven't/hasn't + P2

`?)` Have/Has +S + P2 ?