`-` Áp dụng:

`+)` thì quá khứ đơn:

`->` (+) S + Ved/2 + ...

`->` (-) S + didn't + V

`->` (?) Did + S + V?

___________________________________________

1.

(-) He didn't write a book

(?) Did he write a book?

2.

(-) She wasn't my books?

(?) Was she my book?

3.

(+) They built a new house

( ? ) Did they build a new house?

4.

(+) I was at the concert last Sunday

(?) Was you at the concert last Sunday?

5.

(+) I bought clothes in this children shop

(-) I didn't buy clothes in this children shop

6.

(+) They were born in Korea

(-) They weren't born in Korea

`@` Cấu trúc thì QKĐ:
`(+)` Khẳng định: S + Ved/V2

`(-)` Phủ định: S + didn't + V_inf

`(?)` Nghi Vấn: Did + S + V_inf...?

___________________________________________

Đáp án:

`1.` `(-)` He didn't write a book.

      `(?)` Did he write a book?

`2.` `(-)` She wasn't my books?

      `(?)` Was she my book?

`3.` `(+)` They built a new house.

      `(?)` Did they build a new house?

`4.` `(+)` I was at the concert last Sunday.

      `(?)` Was you at the concert last Sunday?

`5.` `(+)` I bought clothes in this children shop.

      `(-)` I didn't buy clothes in this children shop.

`6.` `(+)` They were born in Korea.

      `(-)` They weren't born in Korea.