A. TYPE 1

1. If the land is polluted, the farmers will unable to grow crops

-> Để "If" lên đầu, thay vế sau thành thì tương lai

2. If people build too many telephone and overhead powerlines, there will be visual pollution 

-> Đổi vị trí của 2 vế, để "If" lên đầu, thay vế sau thành thì tương lai

3. If people use contaminated water for cooking, Their health will be badly affected

-> Như câu 1

4. If we place dustbins in many places, people wont throw rubbish everywhere

-> Như câu 1
5. If the factory installs a new filtration system the industrial waste will be well-treated
-> Như câu 2 (cả 2 câu nếu bạn muốn nhanh thì cứ đặt "if" ở giữa)
B.Type 2

6. If the factory wasn't located near our village, there won't be air pollution and noise pollution.

-> Bạn cứ làm bình thường như bài trên nhưng chuyển thành phủ định

7. If they had fresh water, the local people wouldn't have to use water from the polluted river

-> Như câu 2 (TYPE 1)

8. If Mr.Quang didn't work in a noisy environment, his hearing wouldn't become worse.
-> Như câu 1

9. if the factory treated its waste well, there wouldn't be serious water pollution .

-> Như câu 2 (TYPE1)

1. If the land is polluted, the farmer will be unable to grow crops

2. if people build too many telephone poles and overhead power lines, the will be visual pollution

3. if people use contaminated water for cooking, their health will be badly affected

4. if we place dustbins in many places, people won't throw rubbish in everywhere

5. if the factory installs a new filtration system, the inđsutral waste will be well-treated

6. If the tactory wasn’t/ weren’t located near our village, there wouldn’t be air pollution and noise pollution.

7. If the local people had fresh water, they wouldn’t have to use water from the polluted river.

8. If the soil wasn’t/ weren’t badly polluted, trees and grasses could/ would grow here.

9. If Mr. Quang didn’t work in a noisy environment, his hearing wouldn’t become worse.