1, If he didn't speak very quickly, l could understand him.

2,If l knew his address, l could visit him.

3,If you don't do your homework, you will be punished by the teacher.

4,If you don't tell the police the truth,they will believe you.

5,If you don't keel your feet dry ,you will believe you.

6,If you don't learn hard,you will not get bad marks.

7,If we don't save the electricity, we have run out of energy.

8,If you throw the trash in the street, the air will be polluted.

9,Unless they are taken to the hospital, they will be died. ( Câu này bn vt nhầm died thành did nên mik sửa lại nhá )

10,Unless it is rain, we wil have a picnic

1he speak very quickly so i can't understand him

->If he spoke very quickly, I couldn't understand him

2 I don't know his address ,that's why I can't visit him

->If I knew his address, I could visit him

3Do your homework or you will be punished by the teacher

->If you don't do your homework, you will be punished by the teacher

4 tell the police the truth , they will believe rou

->If you tell the police the truth, they will believe you

5 keep your feet dry or you will get a cold 

->If you don't keep your feet dry, you will get a cold

6 learn hard or you will get bad mark

->If you don't learn hard, you will get bad mark

7save the electricity or we have run out of energy

->If we don't save the electricity, we have run out of energy.

8 don't throw the trash in the street , the air will be polluted

->if you throw the trash in the street, the air will be polluted.

9 they will be died if they aren't taken to the hospital

->unless they are taken to the hospital, they will be died.

10 we will have a picnic unless it rains

->if it doesn't rain,we will have a picnic.

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