You must

You mustn't

Arrive at school by half past seven every morning.

Wear jeans.

Hand in your homework by eight.

Eat or drink in the classroom.

Look clean and tidy.

Bring MP3 to school.

Be quiet in the library.

Run or shout（大喊） 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.