`1`.She used to collect stamps 

`->` S + used to + V-inf : Đã từng

`2`.Do you spend `3` hours doing this task ?

`->` Thì HTĐ ( NV ) : Do / Does + S + V ?

`=>` Do `+` You , They

`->` S + spend + time + V-ing : Dành thời gian làm gì

`3`.David is not high enough to reach that shelf

`->` Enough :

`=>` S + is / am / are / ... ( not ) + adj + enough ( for O ) + to do sth

`=>` Đủ để làm gì

`4`.Children oughtn't to play in the kitchen

`->` S + ought ( not ) + to do sth : ( Không ) nên làm gì

`5`.Lan wasn't helped paint the picture

`->` BĐPĐ `-` QKĐ : S + wasn't / weren't + VpII ( by O )

`\text{# TF}`

`1`. She used to like collecting stamps.

`-` Chỉ thói quen trong QK: used+ to V: quen làm gì

`2`. Do you spend `3` hours doing this task`?`

`-` spend+ time+ Ving: dành TG để làm gì

`3`. David is not tall enough to reach that self.

`-` Cấu trúc: Đủ để làm gì ( `1` chủ thể): S+ be+ ( not)+ adj+ enough+ to V

`4`. Children oughtn't to play in the kitchen.

`-` shouldn't+ V `=` oughtn't+ to V: không nên làm gì

`5`. Lan wasn't help to paint the picture.

`-` Câu bị động ( thì QKĐ, thể phủ định): S+ was/ were+ not+ Vpp+ [ by O]+...