$33.$ If we keep the environment clean, we won't suffer from pollution.

- If + S + V (s/es), S + will + (not) + V.

$34.$ I haven't visited my native village since I was ten.

- S + have/has + (not) + V3.

$35.$ Flying cars will be used to travel across the globe some day.

- S + will + be + V (Pii) + (by O).

$36.$ Veronica is a good friend of mine.

$37.$ There is a shortage of clean water in this country.

- There is + a/ an + Danh từ số ít/ Danh từ không đếm được + O...

$38.$  Children living in slums often suffer from malnutrition.

- S + V (s/es).

- Vì "children" là danh từ số nhiều. → Giữ nguyên động từ.

$39.$ Overpopulation is a serious problem, isn't it?

- Tag question. Phần mệnh đề ở dạng khẳng định thì phần láy đuôi ở dạng phủ định.

$40.$ There are less air pollution and traffic in the countryside.

`33` If we keep the environment clean, we won't suffer from pollution.

Câu điều kiện loại 1: If+ S+ V(s/es), S+ will/ can/ may+ V-inf.

`34` I haven't visited my native village since I was ten.

Cấu trúc: S+ last+ V2/ V-ed. = S+ have/ has (not)+ Vp2.

`35` Flying cars will be used to travel across the globe someday.

Câu bị động của will: S+ will be+ Vp2+ by O.

`36` Veronica is a good friend of mine.

Dịch: Veronica là một người bạn tốt của tôi.

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`37` There is a shortage of clean water in this country.

Cấu trúc: There is+ a/ an+ N(số ít/ ko đếm đc).

`38` Children living in slums often suffer from malnutrition.

Vì Children living in slums là Ns `to` V-inf.

`39` Overpopulation isn't a serious problem, is it?

Câu hỏi đuôi: theo câu này là trước phủ định sau khẳng định.

`40` There are less air pollution and traffic in the countryside.

Cấu trúc: less+ N(số ít/ ko đếm đc).