Complete the list of school rules, using must, mustn't or (don't) have to.

School Rules

Students who are new to the school please note the following:

• You must be on the school grounds at least ten minutes before classes start.
• You must always ask for your teacher's permission if you want to leave the classroom.
• You must bring a packed lunch every day; the school canteen is open all day.
• You mustn't run in the corridors. It isn't allowed.
• You mustn't leave the school grounds during school hours without permission.
• Your parents must call the school in case you are absent or late.