must
1.You must get up early.
2.You must listen to the teacher carefully.
3.You must work hard.
4.You must do your homework.
5.You must get to school on time.
mustn't
You mustn't get up late.
You mustn't talk in class.
You mustn't play football in the street.
You mustn't tell a lie to parents.
You mustn't point at others with chopsticks.
