have to/must/should用法点滴

摘要

cqvip:My friends, we have to spend this year together and we must try to spend ittogether happily. You should study hard and be good students.(朋友们,我们要在一起度过这一年,我们要尽力使这一年过得愉快。你们都要努力学习,争取做好学生。)