Bài tập 8. Rewrite these sentences, using must, mustnt, should, shouldnt. 9. Its very important for you to be here at 6.00. You 10. Phuc wants to visit Ayres Rock. Phuc would 11. Its against the rules to make noise in the library. You 12. Shall we go to Ha Long Bay this weekend? How about 13. I went swimming every Thursday when I was at school. I used ____________________________________________________________ 14. Mai walked to school when she was in primary school. Mai went __________________________________________________________ 15. Why don't we cycle to the town at the weekend? How about ________________________________________________________? 16. Did your father use to drive to work? Did your father use to travel___________________________________________?