=>

1. (-) It wasn't hot last summer.

(?) Was it hot last summer?

2. (-) They didn't play football yesterday.

(?) Did they play football yesterday?

3. (-) Last week I didn't have an important meeting.

(?) Did you have an important meeting last week?

4. (-) He didn't work as an accountant from 1995 to 2000.

(?) Did he work as an accountant from 1995 to 2000?

5. (-) Jim and Claire weren't tired of doing the same thing in the office yesterday.

(?) Were Jim and Claire tired of doing the same thing in the office yesterday?

Thì QKĐ

Với động từ tobe:
(+) S was/were...

(-) S was/were not...

(?) Was/Were S...?

Với động từ thường:
(+) S V2/ed

(-) S didn't V

(?) Did S V?