1、Period 4 GrammarModal Verbs The first wealth is health .健康是人生第一财富。 A light heart lives long.豁达者长寿。 Early to bed and early to rise makes a man healthy , wealthy and wise.早睡早起会使人健康、富有和聪明。 Without health no pleasure can be tasted by man.没有健康就没有乐趣。 Good health is over wealth.健康是最大的财富。 What should/should
2、nt we do to keep healthy?If youd like to give advice or opinions, you can use should/ ought to/ had better doWhat ought we to do to keep healthy?Good habits can help us to keep healthy and bad ones can cause diseases. There is a serious disease called H1N1 flu these days. It spreads easily among peo
3、ple in spring and autumn. The flu is a serious disease, but we dont have to be afraid of it. We can do something to prevent it. But how? We ought to keep the air fresh all the time. We ought to keep away from crowded places. We d better drink more water every day. You should go to school right away.
4、 Its eight oclock now. He should be at work. It seems so unfair this should happen to me. You should have reminded me of the meeting. What should we do now?表惊讶：竟然用于第一人称疑问句，询问对方的意愿表责备，谴责What kind of food must we eat to be strong?must / have toMust I finish the task right now?Yes, you must/ you have t
5、o.No, you neednt / you dont have to .She called me yesterday evening but I didnt hear it. I _ (be) asleep. must have been 1. -Will you stay for lunch?-Sorry, _. My brother is coming to see me.A. I mustnt B. I cantC. I neednt D. I wont2. -May I pick a flower in the garden? - _.A. No, you neednt B. No
6、t, please.C. No, you mustnt D. No, you wont.3. You _ return the book now. You can keep it till next week if you like.A. cant B. mustnt C. neednt D. may not4. John, you _ play with the knife, you _ hurt yourself.A. wont ; cant B. mustnt ; may C. shouldnt ; must D. cant ; shouldntC B B C mustntneednt shouldnt cant表示否定的情态动词的用法 : 不准 , 禁止没必要 ( = dont have to )不应该 ( = ought not to )不能，不可能Could you use them to make sentences?
