I

+ công thức if loại 1: If + hiện tại đơn, S+will,can,should + V

1. If the weather is (be) hot, I will go (go) swimming.

2. They will pass  (pass) the exam if they study (study) hard.

3. If the water is (be) polluted, the aquatic plants will die (die).

4. The river won't be (not be) polluted if people don't dump (not dump) too much waste into it.

II

công thức if loại 2: if + quá khứ đơn, S+ would/could + V

1.if I had money, I would buy a villa

2. they would go swimming if the weather were good

+ cách làm bài này là dựa vào các từ đã cho và chuyển sang loại 2

+ những câu ở dạng phủ định thì ta sẽ phải chuyển sang khảng định

III

-First of all, find a way to cut the pollution source immediately.

-Reduce the use of plastic, avoid disposing of oils in sinks.

-Dispose of garbage properly, avoid throwing it in toilets or sinks.

-Limit the use of detergents, pesticides, and chemicals.

-Use water wisely, start conserving it by using methods like rainwater harvesting.