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单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,*,八年级下,册,第,10,讲,Units,3-4,情态,动词,八年级下册,本身有一定的词义，,表示说话人的情绪、,态度或语气的动词。,定义,本身有一定的词义，表示说话人的情绪、态度或语,常用词,can(could),may,(might),must,shall,(should),will(would),had better,have to,need,等,。,常用词,I can sing very well.,She can dance beautifully.,用法与特点,1.,有一定的词义，但并不完整，必须与实义动词一起构成谓语。,I can sing very well.She,2.,后接动词原形，即不带,to,的不定式。,She may lose her way in the village.,You must do it now with his help.,2.后接动词原形，即不带to的不定式。She may,3.,无人称和数的变化。,We must stay here at this time.,He must stay here at this time.,3.无人称和数的变化。We must stay he,4.,具有助动词作用，可以用来构成否定句，疑问句及用于简单回答。,We cant carry the heavy box.,Can you sing an English song,?,Yes,I can./No,I cant.,（否定句）,（疑问句）,（简单回答）,4.具有助动词作用，可以用来构成否定句，疑问句及用于简单回,特殊用法,1.,以,May,开头的一般疑问句，否定回答常用,mustnt,。,May I dance here after dinner?,No,you mustnt.,（否定回答）,特殊用法1.以May开头的一般疑问句，否定回答常用must,2.,以,Must,开头的一般疑问句，否定回答常用,neednt/dont have to,。,Must I read books every day?,No,you neednt.,/No,you dont have to.,（否定回答）,2.以 Must开头的一般疑问句，否定回答常用neednt,3.,情态动词表推测。,He may know the answer to this question.,It is cold in the room.They must have turned off the heating.,(1),在肯定句中一般用,must(,一定,),can/could(,可能,),may/might(,也许,或许,),。,3.情态动词表推测。He may know the a,It cant be the headmaster.He has gone to America.He will be back in two weeks.,He may not know the scientist.Im not sure.,(2),在,否定句中用,cant/couldnt(,不可能,),，,may not/might not(,可能不,),。,It cant be the headmaster.,易错警示,_ she_ her uniform to school today?,A.Need;wear B.Does;need wear,C.Does;needs wearD.Need;wears,【,点拨,】,need,作实义动词时，有两种用法：,1.need to do sth.,需要做某事,2.need doing sth.,需要被做某事（,=need to be done sth.,）,；作情态动词时，后加动词原形，通常只用于疑问式或否定式。,【答案】,A,易错警示_ she_ her uni,易错警示,Could I come later tomorrow?Yes,you _.,A.can B.could C.do D.cant,【,点拨,】,could,也可表示请求，语气委婉，主要用于疑问句，不可用于肯定句，肯定回答应用,can,，否定回答可用,No,Im afraid not.,【答案】,A,易错警示Could I come later tomorr,高频考点,高频考点,Is that Mr.Zhou?,It _ be him.He has gone to Beijing.,A.mayB.canC.cant D.mustnt,（,海南中考改编,）,解析：,考查情态动词表推测的用法。由答语,He has gone to Beijing,“他去北京了”，可推断那个人不可能是周老师，表示否定推测。,答案：,C,Is that Mr.Zhou?（海南中考改编）解析：考,Must I finish reading the book today,Mr.Brown?,No,you _.You can finish it in two days.,A.neednt B.mustnt C.cant D.couldnt,（,黄冈中考,）,解析：,考查情态动词的使用规则。句意：,布朗先生，我必须今天看完这本书吗？,不，你不必。你可以在两天之内看完这本书。,must,引导的一般疑问句，否定回答用,neednt,，意为“不必”。,答案：,A,Must I finish reading the bo,The boys can play chess in the afternoon.,（改为否定句）,The boys _ chess in the afternoon.,（,重庆中考,）,cant play,解析：,考查含有情态动词的否定句形式。句意：男孩子们下午可以下象棋。,can,“能；会；可以”是情态动词。含有情态动词的肯定,句改为否定句时直接在情态动词后加,not,。,答案：,cant play,The boys can play chess in the,You should _(,道歉,)to her for your mistake.,（,柳州中考,）,apologize,解析：,考查情态动词的用法。句意：你应该为你的错误向她道歉。,should,“应该”是情态动词，后加动词原形。“道歉”动词的英语表达是,apologize,。,答案：,apologize,You should _(道歉)t,
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