1.1.

(-) Jenny didn't wear a dress to the meeting

(?) Did Jenny wear a dress to the meeting?

2.2.

(-) The teacher didn't speak English in the lesson

(?) Did the teacher speak English in the lesson?

3.3.

(-) It wasn't so sunny and hot yesterday

(?) Was it sunny and hot yesterday?

4.4.

(-) My sister didn't try to bake a cake last weekend

(?) Did your sister try to bake a cake last weekend?

5.5. 

(-) They didn't go to Europe on their last summer holiday

(?) Did they go to Europe on their last summer holiday?

6.6.

(-) John didn't have lunch at the cafeteria last Monday

(?) Did John have lunch at the cafeteria last Monday?

7.7. 

(-) Jimmy and Jane didn't get up early yesterday morning to jog

(?) Did Jimmy and Jane get up early yesterday morning to jog?

8.8.

(-) She wasn't old enough to take the responsibility

(?) Was she old enough to take the responsibility?

9.9. 

(-) He didn't buy the milk at the shop over there

(?) Did he buy the milk at the shop over there?

10.10.

(-) They didn't plant trees in the spaces between the houses

(?) Did they plant trees in the spaces between the houses?

Quá khứ đơn với động từ thường:

(+)(+) S + Ved/2

(−)(-) S + didn't + V

(?)(?) Did + S + V?

Quá khứ đơn với tobe:

(+)(+) S + was / were + ..

(−)(-) S + wasn't / weren't + ...

(?)(?) Was/Were + S + ...?