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

  (?) Did he write a book?

2.(-) She wasn't my boss

   (?) Was she my boss?

3.(-) They didn't build a new house.

  (?) Did they buy a new house?

4.(-) I wasn't at the concert.........

   (?) Was i at the concert.........?

5.(-)I didn't buy....

　(?) Did I buy......?

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

   (?) Were they born in Korea....?

Mấy câu khác cũng tương tự như vậy. Câu khẳng định mà V²ed thì sang câu phủ định là didn't+V. Còn câu khẳng định mà mượn was/were thì thêm not. Câu hỏi thì chuyển lại thành V chuyển Did lên đầu câu(hoặc Was/Were).

CHÚC CẬU HỌC TỐT

1. He didn't write a book.

Did he write a book?

2. She wasn't my boss.

Was she your boss?

3. They didn't build a new house.

Did they build a new house?

4. I wasn't at the concert last Sunday.

Were you at the concert last Sunday?

5. I didn't buy clothes in this little shop.

Did you buy clothes in this little shop?

6. They weren't born in Korea.

Were they born in Korea?

7. My sister didn't go to her office by car.

Did you sister go to her office by car?

8. He didn't cook well last year.

Did he cook well lats year?

9. She didn't speak English fluently.

Did she speak English fluently?

10. They didn't invite us to their party.

Did they invite you to their party?