1.If I didn't live by the sea, I wouldn't be worried about global warming
2. If I were you, I would use energy efficient light bulbs.
3. If Paul thought about the planet, he wouldn't waste so much water.
4.If a person looks at the sky at night, he won not be able to see the Milky Way by naked eye.
5. If noise pollution happens regularly, it will cause stress or nuisance.

6. If water pollution doesn't get more serious in the future , it won't affect the development of economy and societly.
7. If Australia has invested in water in Vietnam with good results,half of the population in the rural area will have access to fresh water.
8. If you use compact light bulbs,you will save a lot of energy.
9.If we have more space,we will plant more trees.

10.If they had enough money,they could buy a new car.
11. If there were a library in my neighborhood, i could borrow books.
12.If my health were good, i would play extreme sports.
13. If my father weren't busy wat work, he wouldn't rarely have time for me.
14.If i had much free time, i could come to your party.
15. If Jim had any siblings, he wouldn't feel lonely somtimes