1. It's necessary to wear a uniform at this school. → You must wear a uniform at this school.
2. It's not allowed to park here. → You mustn't park here.
3. It's a good idea to apologize. → You should apologize.
4. It's not necessary to bring food. → You don't have to bring food.
5. I advise you to visit the dentist. → You should visit the dentist.