1. If noise pollution happens regularly, it will cause stress or nuisance.

2. If water pollution gets more serious in the future, it will affect the development of economy and society.

3. If Australia has invested in water in Vietnamwith good results, half of the population in the rural areas will have access to fresh water.

4. If you use compact light bulbs, you can save a lot of energy.

5. If we have more space, we can plant more trees.

Ex4:

1. I would grow a lot of flowers.

2. I wish I had some money.

3. I would buy many things.

4. I would put many garbage bins around the school yard 

Bài 1:

Cấu trúc câu điều kiện loại I: If+S+V(hiện tại đơn), S+will+V

- If  noise pollution happens regularly, it will cause stress and nuisance 

- If water pollution gets more serious in the future, it will affect the development of economy and society

- If Australia invests in water in Vietnam with good result, half of the population in the rural areas will access to fresh water

- If you use compact light bulbs, you will save a lot of energy

-  If we have more space, we will plant more trees.

Bài 2:

Cấu trúc câu điều kiện loại II: If+S+V(quá khứ đơn), S+would+V

- If I had a garden of my own, I would plant more trees

- If I had one wish, I would dream of a castle of food

- If I won 1 million, I would raise the fund for the poor around the world

- If I were a principal, I would plant more trees to make school ground greener.