Cho dạng đúng của động từ trong ngoặc 1.The girl (feel) ill so she (not go) to work. 2. When I (read) a book, I (hear) a knock, I (go) to the door and (open) it, but I (not recognize) my friend at first because I (not wear) my glasses.

`@` Công thức QKĐ : 

Khẳng định: S + V2/ed + O

Phủ định: S + didn’t + V_inf + O

Nghi vấn : Did + S + V_inf + O?

`@` Công thức QKTD : 

Khẳng định: S + was/were + V_ing + O

Phủ định: S + was/were + not + V_ing + O

Nghi vấn: Was/were + S + V_ing + O?

`-------------------` 

`1`. The girl felt ill so she did not go to work.

`-` QKĐ : S + didn’t + V_inf + O

`-` Cô gái bị ốm nên không đi làm.

`2`.When I was reading a book, I heard a knock, I went to the door and opened it, but I did not recognize my friend at first because I was not wearing my glasses.

`-` QKTD : S + was/were + V_ing + O

`-` Đang đọc sách thì nghe có tiếng gõ, tôi ra mở cửa nhưng ban đầu tôi không nhận ra bạn mình vì không đeo kính.

`#T h ả o N g u y ê n ` 

#$Heo$ $Quay$

`1`.felt - didn't go.

`2`. was reading - heard - went - didn't recognize - was not wearing.

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`@` Cấu trúc TQKĐ :

(+) S + V_ed/V2.

(-) S + did not + V.

(?) Did + S + V?

`@` Cấu trúc TQKTD :

(+) S + was/were + V_ing.

(-) S + was/were + not + V_ing.

(?) Was/Were + S + V_ing.