You should not sit on your legs but you should sit on the chair.
9. Our classroom is dirty and messy.
You should not leave litter, and you should tidy up the class.
10. I have a toothache.
You should not eat chocolate. You should brush your thooth every day.
11. I can’t stop yawning.
You should go to the bed. You should not hold back drowsiness.
12. I have hiccups.
You should drink water. You should not be hiccupping continuously.