Must
we must listen to the teacher.
we must work.
we must respect the rules.
we must respect our teachers.
we must stand up when the teacher arrives in the classroom.
we must put our hands up before speaking.
we must put papers in the bin.
we must sleep.
we must eat.
we must respect our friends.
we must do our homeworks.
Mustn't
we mustn't eat chewing-gum in class.
we mustn't run in the corridors.
we mustn't speak too loud in the corridors.
we mustn't sleep in class.
we mustn't write on the tables.
we mustn't send SMS during the lesson.
we musn't wear a cap in the classroom.
we mustn't listening music in the classroom
