You must/mustn't do your homework and lessons every day.
must
You must/mustn't help others when they ask for help.
must
You must/mustn't know what is good and bad and stand behind your actions.
must
You must/mustn't forget your homework, books and pens at home.
mustn't
You must/mustn't eat in class.
mustn't
You must/mustn't always be in favour for your classmates and teachers.
must
You must/mustn't sleep in class.
mustn't
You must/mustn't run and shout at class and at school.
mustn't
