Answer:
1. He has to study for this exam, so he can't go out.
2. Due to her laziness, she can't pass the exam.
3. If he pays me tonight, I will have enough money to buy a car.
4. Her extreme shyness prevents her from enjoying the party.
5. After getting a work permit, I will stay for another month.
6. Study hard, or else you won't pass the exam.
7. Exercise patience, or you will make a mistake.