Jawaban:

3.you should stay at home.you should not go out now or you will get wet

4 you should drink your medicine and take a rest.you should not drink something cold

5.they should put it in the litter bin.they should not make this class dirty

6.you should sit in front of the class.you should not sit in the back row if you don't wear glasses

7.you should call if you miss him.you should not just sit and do nothing.

8.you should sit on the chair.you should not sit on your legs

9we should clean and tidy our classroom.we should not let the class become messy

10you should go to the dentist.you should not forget to brush your teeth after eating food

11.you should go to sleep now.you should not stay up late every night