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1、情态动词,You _ wash your hands before meals. It is good for your health. A. may B. can C. must D. cant,情态动词,特征：,具有,后接动词,否定直接加,没有 变化,表示说话人对事情态度和观点（如可以，必须等）,词义,原形,not,第三人称单数,-Could Mr. Li speak English at 6? -_. A. Yes, he canB. No, he cant C. No, he couldnt D. Yes, he may,can,could,表能力,Can 现在、将来Could 过去,
2、be able to可用于各种时态,（用谁提问就用谁回答）,主观,客观,-_I swim here? -Im sorry. Children _ swim alone here. A. Must; cant B. May; must C. Can; mustnt D. Cant; can,表请求,Yes, you may/can.,No, you cant/mustnt.,can,could,may,might,注：could比can、might比may语气更委婉，而不是过去式,May you have a bright future！,May sb. do 祝愿某人,Wish you a l
3、ong life!,wish sb sth 祝愿某人,表祝福,may,-Must we clean the room right now? -No, you_. You _clean it after lunch. A. neednt; may B. neednt; must C. mustnt; can D. mustnt；may,肯定回答：-Yes, . must.,否定回答：-No, . neednt / dont have to.,作实义动词,作情态动词,无肯定形式；否定式：neednt do sth,肯定形式：need to do sth 否定形式：dont/doesnt/didnt
4、 need to do sth,need,表示：需要,must/need+sb.+do sth?,can,能力,请求,现在/将来can,过去could,肯定：Yes, I can.否定：No, I cant.,肯定：Yes, I could.否定：No, I couldnt.,could,肯定：Yes, you can.否定：No, you cant /mustnt.,更委婉,may,更委婉,肯定：Yes, you can/may.否定：No, you cant/mustnt.,请求,might,必须,must,肯定：Yes, you must.否定：No, you neednt/dont h
5、ave to.,mustnt 表禁止,三大金刚,推测,肯定,否定,cant may/might not不可能 可能不,1.-Have you decided which senior high school to choose? -Not yet. I _ go to Moonlight school.A. must B. may C. need D. should2.-Look, the light in the teachers office is still on. Mr. Li is working there. He always works late at night. -It _
6、 be Mr. Li. Hes gone to London for a short visit.A. cant B. mustntC. mayD. need,must may/might 一定 可能,三大姐妹,need should shall will would,need,01,02,情态动词：,实意动词,肯定：,否定：,need to do sth,dont need to do sth,一般不用于肯定，否定neednt do sth,They _ help then. They managed to do it by themselves.A. didnt need anyB. di
7、dnt need toC. neednt anyD. didnt need to any,_ we go shopping together ？,Shall,shall,疑问句征求意见，第一人称,Nothing _ stop me once I have made up my mind.,表示决心,You shall get my kiss when you finish your game . (表允诺),在陈述句表示说话者的允诺、规定（法律、交规）等，主要用于第二、三人称,lets与 let us在反义疑问句,无论肯定否定, Lets 永远shall we Let us 永远will yo
8、u,shall,Itistherulethateverydrivershallobeyinthiscity.(表规定),Lets watch the news on TV,_? Let us watch the news on TV, _?,shall we,will you,You _ pay more attention!,should,should,应该（表责任、义务、建议）,_ you get me some paper, please? A. Shall B. May C. Will D. Need,用于第二第三人称疑问句，提出请求或征求意见,will/would,shall,sho
9、uld,用于第一人称，表示征求意见、询问,用于第二、三人称, 表示说话人的意图、允诺、命令,will/would,You shall have my answer tomorrow.,You shall do as I tell you.,You shall be sorry for it one day, I tell you.,It seems unfair that this should happen to me.,常用来表示义务、责任，或符合常理的,询问请求（第二、三人称）,现在的意愿,had better,have to,不得不（客观）,最好,三大怪兽,具有情态动词特征的词组,否定：,used to,过去常常,had better not,used not to,didnt use to,He used to tell lies.,He used to _with his parents, but now he is used to _ with his classmates at school.A. live; livingB. live;liveC.living; livingD. living; live,dont/doesnt/didnt have to,Thank You,