1.Students are more aware of protecting the environment. Teachers teach environmental issues at school.

=> If teachers teach environmental issues at school , students will be more aware of protecting the environment.

2.Light pollution happens. Animals change their behaviour patterns.

=> If light pollution happens , animals will change their behaviour patterns.

3.The levels of radioactive polluion decrease.We switch from nuclear power to renewable energy sources.

=> If we switch from nuclear power to renewable energy sources, the levels of radioactive polluion will decrease.

4.The water temperature increases.Some aquatic creatures are unable to reproduces.

=>If the water temperature increases, some aquatic creatures will be unable to reproduces.

5.People get more diseases.The water is contaminated.

=> If the water is contaminated, people will get more diseases.

Áp dụng công thức If loại 1 : If hiện tại , tương lại 

1. Students will be more aware of protecting the environment if teachers teach environmental issues at school.

2. When light pollution happens, animals will change their behavior patterns.

3. The levels of radioactive pollution will decrease if we switch from nuclear power to renewable energy sources.

4. If the water temperature increases, some aquatic creatures will be unable to reproduce.

5. People will get more diseases if the water is contaminated.