`1.` If the water weren't contaminated, people wouldn't get more diseases.

`2.` If people didn't throw rubbish in the street, the street would look attractive.

`4.` If teachers didn't teach environment issues at school, students wouldn't be more aware of protecting the environment

`5.` If there weren't so much light in the city at night, we could see the stars clearly

`->` Câu điều kiện loại `2`: Trái với hiện tại

`+` If + S + V(QKĐ), S + would/ could (not) + V

`-` QKĐ: Quá khứ đơn

`+` Dạng tobe: `(+)` S + was/ were+ ........ - Were : Đi với mọi S

`+` Dạng V thường: `(+)` S + Ved/ V2

`3.` Food and blankets have been given out to homeless people by volunteers.

`-` Bị động - Hiện tại hoàn thành

`(+)` S + have/ has + been + PII (by....)

`-` She/ he/ it và N số ít - has `|` I/ you/ we/ they và N số nhiều - have