Помогите пожалуйста! Безотлагательно( 9 задание)

1. You dont need to arrive before 9:30.
2. Students are not allowed to bring food into the classrooms.
3. You shouldnt eat too much junk food.
4. If I could afford it, I would be able to buy a new laptop.
5. You can go on the school trip if you have enough money.
6. You ought to go to bed early if you have en exam.
7. If you want to run the marathon, you better start training as soon as possible.
8. You have to wear a helmet if you ride a motorbike.