***
1. If teachers teach environmental issues at school, students will be more aware of protecting the environment.
-> Nếu giáo viên dạy các vấn đề môi trường ở trường, học sinh sẽ có ý thức hơn trong việc bảo vệ môi trường. 

2. If light pollution happens, animals will change their behaviour patterns.
-> Nếu ô nhiễm ánh sáng xảy ra, động vật sẽ thay đổi hành vi của chúng 

3. If we switch from nuclear power to renewable energy sources, the levels of radioactive pollution will decrease.
-> Nếu chúng ta chuyển từ năng lượng hạt nhân sang các nguồn năng lượng tái tạo, mức độ ô nhiễm phóng xạ sẽ giảm xuống. 

4. If some aquatic creatures are unable to reproduce, the water temperature will increase.
-> Nếu một số sinh vật dưới nước không có khả năng sinh sản, nhiệt độ nước sẽ tăng lên.

5. If the water is contaminated, people will get more diseases.
->  Nếu nước bị ô nhiễm, con người sẽ mắc nhiều bệnh hơn.
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1. would look
2. would join
3. would be
4. wouldn't dump
5. would happen
6. were
7. would be
8. had
9. wouldn't be
10. would grow
***
1. Là câu ví dụ
2. If there weren't so many billboards in our city, people could enjoy the view.
3. If there weren't so much light in the city at night, we could see the star clearly.
4. If we didn't turn on the heater all the time, we wouldn't have to pay three million dong for electricity a month.
5. If the karaoke bar didn't make so much noises almost every night, the residents wouldn't complain to its owner.
6. If she didn't work in a noisy office, she wouldn't have a headache after work every day.