You must

You mustn't

Arrive at school by 7:30 every morning.

Wear jeans.

Hand in your homework by 8:00.

Eat or drink in the classroom.

Look clean and tidy.

Bring MP3 to school.

Eat or drink in the dining hall.

Run or shout in the school buildings.

Stay on the playground at break time.

Talk loudly in the hallways.

Stand up when a teacher comes into the classroom.

Fight.