TYPE 1

if i have time,i will watch a movie

if we don't hurry up,we will miss our flight

TYPE 2

if i spoke English,i would work in America

if i had a lot of money,i could travel everywhere

if i were you,i wouldn't do that

TYPE 3

If I had studied harder, I would have passed the exam

If it hadn't rained, she would have gone to the beach

She would have been there on time if her car hadn't broken down

If he hadn’t got a job in London ,he would have married Jennie.

by us

If we plant more trees, the air will be cleaner

Sử dụng conditional sentences type 1 vì nó có thể là hiện thực

If she earns a lot of money, she will fly to New York.

If she didnt work in a noisy place , she wouldnt has a headache .

Tại sao nước biển lại mặn? 

If we stayed in the same hotel , we could share a room

1. If a person don't look at the sky at night, he will able to see the Milky Way by naked eye .
2. If noise pollution doesn't happen regularly, it will not cause stress or nuisance .
3. If water pollution doesn't get more serious in the future, it will not affect the developement of economy and society 

4. If Australia doesn't invest in water in Vietnam with good results, half of the population in the rural areas doesn't access to fresh water.

5. If you don't use compact light bulbs, you won't save a lot of energy

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

Unless he listens to people, he will never have many friends

If you buy her a bunch of flowers, she'll forgive you.

If you tell me the truth, I can help you.

If you learn the rules by heart, you'll be able to do the exercise.