`21`.Justin said to Mon that he would do it

`\rightarrow` Câu tường thuật : S + said to / told + O + that + S + V ( lùi thì )

`\rightarrow` TLĐ `->` TLTQK : S + would + V

`22`.If you recycle waste paper , you will save natural resources

`\rightarrow` CĐK Loại `1` : Diễn tả hành động có thật ở Hiện tại

`-` If - clause : Thì HTĐ : S + Vs / es

`-` Main - clause : Thì TLĐ : S + will + V

`23`.We wish we could buy this house

`\rightarrow` Mong ước `-` Can : S + wish + S + Could + V

`24`.Our house is going to be repainted next month

`\rightarrow` BĐ `-` Thì TLG : S + is / am / are + going to be + V3 / PII ( by O )

`25`.What is your height ?

`\rightarrow` Hỏi chiều cao : What is + TTSH + height ?

`26`.Who teaches you English ?

`\rightarrow` Thì HTĐ : S + Vs / es ( `26 , 29` )

`\rightarrow` Who dùng để hỏi về người

`27`.We couldn't go on a picnic because it was raining very hard

`\rightarrow` Because + C1 + C2 : Mặc dù

`\rightarrow` Dùng để chỉ nguyên nhân , lý do

`28`.In spite of the cold , they went swimming

`\rightarrow` In spite of / Despite + V-ing / N + Clause : Mặc dù

`29`.My class has thirty-five students

`30`.He asked me where Mai lived

`\rightarrow` Câu tường thuật ( Wh ) : S + asked + O + wh + S + V ( lùi thì )

`\rightarrow` HTĐ `->` QKĐ : S + Ved / V2

`\text{# Kirigiri}`