`36.` It's very important to keep the environment clean.

`-` It `+` be `+` (very/ ...) adj `+` (for O) to V-inf ... : việc làm gì (rất) như thế nào. 

`37.` Mrs. Hoa suggested that I/ we should turn off the lights before going out.

`-` S `+` suggest (chia) `+` that `+` S `+` (should) V-inf ... // S `+` suggest (chia) `+` V-ing... : đề nghị, đề xuất rằng (ai) nên làm gì.

`38.` How about planting some trees around your house to get more fresh air?

`-` Why don't (you) `+` V-inf ...? `≈` How/ What about `+` V-ing ...?: Tại sao lại không ... nhỉ? `≈` Thế còn ... thì sao?

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`***`

$36$. It's very important to keep the environment clean

$→$ It's $+$ adj $+$ to V $+$ ...

$-$ environment (n): môi trường

$37$. Mrs.Hoa suggested you should turn off the lights before going out.

$→$ S $+$ suggest $+$ V nguyên / sb $+$ V

$-$ turn off the lights (v): tắt đèn

$38$. How about plating some trees around your house to get more fresh air?

$→$ How about $+$ V-ing $+$....

$-$ do sth to get sth (v): làm gì đó để nhận (lại) điều gì

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