5. Jane often went to school on foot 3 years ago. (+) (-) (?) 6. (-)The cat didn't want to eat yesterday. (+) (?) 7. (?)Did the train arrive late yesterday? (+) (-) 8. (-) There wasn't anything left in the fridge. (+) (?)

`1. ⇒`

`(-)`They didn't decide to leave soon.

`(?)` Did they decide to leave soon?

`2.⇒` 

`(+)` There were 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 didn't use to be a soldier.

`4.⇒` 

`(-)` My teacher didn’t start teaching here 6 years ago.

`(?)` Did your teacher start teaching here 6 years ago ?

`5.⇒` 

`(-)` Jane didn't 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.

`(?)` Did the cat want to eat yesterday?

`7.⇒`

`(-)` The train didn’t arrive late yesterday.

`(?)` Did the train arrive late yesterday ?

`8.⇒` 

`(+)`There was anything left in the fridge.

`(?)` Was there anything left in the fridge ?

`→` Cấu trúc thì quá khứ đơn (với to be):

`(+)` S + was/were + C

`(-)` S + was/were + not + C

`(?)` Was/Were + S + C?

`→` Cấu trúc thì quá khứ đơn (với động từ thường):

`(+)` S + V2(ed/BQT) + (O).

`(-)` S + did + not + V0 + (O).

`(?)` Did + S + V0 + (O)?

             $\text{#Alice}$