`1`

`(-)` Nam's parents weren't in Ha Noi last week

`(  ?  )` Were Nam's parents in Ha Noi last week ? 

`2`

`(-)` Thao didn't arrive in Da Lat in the moring

`(  ?  )` Did Thao arrive in Da Lat in the moring ?

`3`

`(-)` Nam wasn't 14 years old last year

`(  ?  )` Was Nam 14 years old last year ?

`4` 

`(-)` Tuan and Hoa didn't visit Paris in 2019

`(  ?  )` Did Tuan and Hoa visit Paris in 2019

Giải thích

Cấu trúc thì QKĐ

Với tobe

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

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

`(  ?  )` Was/were + S + ... ?

Với Vern

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

`(-)` S + didn't + V-inf

`(  ?  )` Did + S + V-inf ?