Must

1.You must listen to your teacher.

2.You must care about teacher's health

3.You must write the exercises which you have at the time of the lesson

4.You must do your homework.

5.You must off your phone.

6.You must learn the subject.

7.You must ask a teacher if you don't understand something.

8.You must tell to teacher if you feel pain.

9.You must tell to teacher if you want to go out.

10.You must tell to teacher if your classmates are bothering you.

1.You mustn't  speak with your classmates at the time of the lesson

2.You mustn't go out from the lesson if you don't ask your teacher

3.You mustn't chatting with friends at the time of the lesson

4.You mustn't bothering your teacher or classmates

5.You mustn't scream or be rude with your teacher if you have a bad mark

6.You mustn't drink an alcohol at the time of the lesson

Дальше сам/сама