5. 1. It's a good idea to wake up early.
You should get up early.
2. It isn't ok to talk in the library.
You must be quiet in the library.
3. It is against the rules to eat sandwiches in the classroom.
We shouldn't eat sandwiches in the classroom.
4. It isn't a good idea to talk and eat at the same time.
You shouldn't eat and talk at the same time.
5. You can't use your mobile during a test.
You musn't use your mobile during a test.
