Rewrite the following sentences starting with if

I.Rewrite the following sentences starting with if.
1. He can’t go out because he has to study for his exam.
If .................................................................................................................................
2. She is lazy so she can’t pass the exam.
If .................................................................................................................................
3. He will pay me tonight; I will have enough money to buy a car.
If .................................................................................................................................
4. He smokes too much; that’s why he can’t get rid of his cough.
If .................................................................................................................................
5. She is very shy, so she doesn’t enjoy the party.
If .................................................................................................................................
6. He doesn’t take any exercises. He is so unhealthy.
If .................................................................................................................................
7. Study hard or you won’t pass the exam.
If .................................................................................................................................
8. Don’t be impatient or you will make mistakes.
If .................................................................................................................................
9. I didn’t eat lunch, I feel hungry now.
If .................................................................................................................................
10. I don’t buy that book because I don’t have enough money.
If .....................................................................................................