Đáp án `+` Giải thích các bước giải:

`31.` If you reduce the use of energy, you won't pay more for it.

`-` Câu điều kiện loại `1` (Có thể xảy ra ở hiện tại hoặc tương lai)

`+` If + S + V(s/es), S + will/can/may/.. + V + ..

`32.` We suggested that Mr. Khoi should put an advertisement in the local newspaper.

`-` S + suggest + that + sb + (should) + V + ...

`+` Ai đó đề nghị ai đó nên làm gì

`-` Why don't you + V ... ?: tại sao không ... ?

`33.` We went for a swim in the river because it was a hot day.

`-` (clause 1), so (clause 2): ____ nên _____

`->` Because (clause 1), (clause 2): Bởi vì ______, ______

`->` (clause 2), because (clause 1): ______ bởi vì ______

`-----------`

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$\color{orange}{\text{Chúc bạn học tốt ạ :33}}$

`31.`

`⇒`  If you reduce the use of energy , you won't pay more for it

`to` If + S + V(HTĐ) , S + can/may/might/will + (not) + V : Câu ĐKL1

`32.`

`⇒` We suggested that Mr. Khoi should put an advertisement in the local newspaper

`to` S + suggested + that + S + should + Vo

`=` Why don't you + Vo ...?

`33.`

`⇒` We went for a swim in the river because it was a hot day

`to` S + V because S + V