Class rules (obligation and prohibition)


Must:                                                            
- You must study
- You must raise you hand
- You must sit properly
- You must copy the vocabolary in your nateboook


Mustn't:
- You mustn't chew gum in classrom.
- You mustn't eat or drink in classroom
- You mustn't open your partner's lockers.
- You mustn't visit facebook in class.