`1`.It's useful to know English well

`->` It is ( not ) + adj ( for O ) + to do sth : Như thế nào để làm gì

`2`.I have learnt English for `5` years

`->` Thì HTHT : S + have / has + VpII

`=>` `DHNB` : for

`->` 

`+` I , You , We , They `+` have

`+` He , She , It `+` has

`3`.Hung isn't as tall as Nam

`->` So sánh ngang bằng ( `3 , 5` ) :

`=>` S1 + is / am / are / ... + as + adj + as + S2

`4`.What time did you go to bed yesterday ?

`->` Thì QKĐ ( NV ) : Did + S + V ?

`->` What time dùng để hỏi về giờ , mốc thời gian [ Tương đương với " When " ]

`5`.This house is not as comfortab;e as the one we saw last month

`6`.They go to the center of the city by bus

`->` Thì HTĐ : S + Vs / es

`->` go + to somewhere : Tới đâu

`->` By + Phương tiện di chuyển , Cách thức , ...

`7`.The actor isn't admired ( by him ) 

`->` BĐPĐ `-` HTĐ : S + isn't / 'm not / aren't + VpII ( by O )

`\text{# TF}`