Modality: can, should, have to, don’t have to

You ... use a dictionary to help you understand new words.

Students ... raise their hand before speaking in class.

You ... finish your math homework before tomorrow's lesson.

You ... bring your own snacks; we'll have a class party today.

You ... ask the teacher for help if you don't understand something.

Students ... line up quietly when mooving between classes.

You ... submit your science project by the end of the week.

You ... wear your uniform on Fridays; it's casual dress day.

You ... participate in the school play if you enjoy acting.

Students ... keep their desks clean and organized.

You ... return library books on time to avoid late fees.

You ... bring your gym clothes today; it's a rainy day, so we'll have indoor activities.