You should listen to the teacher.

You should bring all the things you need for the lesson.

We should keep the class clean and tidy.

We should greet the teacher every morning.

You should study before tests.

You should not eat in class.

We should not be noisy.

You should not sleep in class.

You should not litter in class.

You should not speak while the teacher is explaining.

You must already be home by 7 o'clock.

You must make your bed before leaving for school.

You must help mother by doing your chores.

You must ask for permission before going somewhere.

You must put your dirty clothes in the laundry basket.

You must not argue against your parents.

You must not come home later than 8 o'clock.

You must not litter around the house.

You must not sleep late.

You must not forget doing your chores.