Dưới đây là các câu đã được viết lại ở thể khẳng định, phủ định và nghi vấn ở thì quá khứ đơn:

1.
- (+) They decided to leave soon.
- (-) They did not decide to leave soon.
- (?) Did they decide to leave soon?

2.
- (+) There were many homeless people here ten years ago.
- (-) There were not many homeless people here ten years ago.
- (?) Were there many homeless people here ten years ago?

3.
- (+) Tom’s grandfather used to be a soldier.
- (-) Tom’s grandfather did not use to be a soldier.
- (?) Did Tom’s grandfather use to be a soldier?

4.
- (+) My teacher started teaching here 6 years ago.
- (-) My teacher did not start teaching here 6 years ago.
- (?) Did my teacher start teaching here 6 years ago?

5.
- (+) Jane often went to school on foot 3 years ago.
- (-) Jane did not often go to school on foot 3 years ago.
- (?) Did Jane often go to school on foot 3 years ago?

6.
- (+) The cat wanted to eat yesterday.
- (-) The cat did not want to eat yesterday.
- (?) Did the cat want to eat yesterday?

7.
- (+) The train arrived on time yesterday.
- (-) The train did not arrive late yesterday.
- (?) Did the train arrive late yesterday?

8.
- (+) There was something left in the fridge.
- (-) There was not anything left in the fridge.
- (?) Was there anything left in the fridge?

Hy vọng những câu trên sẽ hữu ích cho bạn!