1.$\Longrightarrow$ Nam didn't use to play badminton when he was young.

2.$\Longrightarrow$ She used to study England 5 years ago.

$\Longrightarrow$ Cấu trúc "used to" 

$\Longrightarrow$ Form:

`(+)` S`+`used to`+`V`+`O : Đã từng làm gì đó trong quá khứ nhưng giờ thì không

`(-)` S`+`didn't`+`use to`+`V`+`O ?

`(?)` Did`+`S`+`use to`+`V`+`O ?

`@Jong`

1. Nam / not/ use to/ play/ badminton / when/ he/ be/ young.

⇒ Nam did not use to play badminton when he was young

2. She/ use to / study/ England / 5 years / ago.

⇒ She used to study in England at 5 years ago.

* Cấu trúc: Used to + Vinf