`16`.What about staying at home and doing our homework ?

`\rightarrow` What about + V-ing ?

`17`.Shall we play football after school ?

`\rightarrow` Shall + S + V ? : Ai sẽ làm gì

`18`.You ought to do exercise regularly

`\rightarrow` S + ought ( not ) + to do sth : Bắt buộc phải làm gì ( `18 - 21 , 27` )

`19`.You ought to wash your hands before meals

`20`.You ought not to be late for school

`21`.You ought to get up early and help your mom

`22`.He must walk to work because he doesn't any vehicles

`\rightarrow` S + must / mustn't + V : Phải / Không được làm gì ( `22 , 24 , 25` )

`23`.Thanh has to do all these assignments first

`\rightarrow` S + have / has / ... + to do sth : Bắt buộc phải làm gì

`24`.They must learn how to keep safe in the water

`25`.He must sign his name here

`26`.You should eat a lot of vegetables because it's good for you

`\rightarrow` S + should / shouldn't + V : Nên / Không nên làm gì

`27`.They ought to go out to relax

`28`.Hoa is a safe driver

`\rightarrow` Thì HTĐ ( ĐT Tobe ) : S + is / am / are + adj / n

`29`.We ride slowly

`\rightarrow` Thì HTĐ : S + Vs / es

`\rightarrow` Trạng từ `=` Tính từ `+` đuôi ly

`30`.Let's go swimming on the weekend

`\rightarrow` Let us + V : Chúng ta cùng làm gì

`\text{# Kirigiri}`