高中英语语法精讲之情态动词3PPT课件.ppt
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1、,情态动词练习,情态动词,can/could,will/ would,may/might,must,shall,should,need,ought to/have to,dare,基本用法,1. 情动+动词原形,had better,2. 没有人称和数的变化( 除“have to”外).,3. 否定式: +not ought not to,can could,1.表“能力” (体力,脑力 或技术),Can you lift this heavy box?,I couldnt understand what he said at all.,2.表“许可” “建议,请求”,You can use
2、a different material instead.,Could you help me carry the box ?,3.表“推测” “可能性”,No, no, it cant be true. What on earth can this mean?,can与could用法对比,We thought the story couldnt be true. / How could you be so careless?,4.cantcouldnt+have+P.P表示对过去的否定推测,他不可能去过那个小镇。 He couldnt have been to that town. 她不可能
3、做这样愚蠢的事. She cant have done such a foolish thing.,He could have finished the task on time, but the heavy snow came.,5.could+have+P.P: 表示本来能做得到, 但事实上未做到.,6.Can+have+done:一般用在疑问句中表推测,1.You dont have to know the name of the author to find a book. You_find the book by the title. (08湖南) must B.need C.can
4、 D.would 2.Peter_be really difficult at times even though hes a nice person in general.(08辽宁) A.shall B.should C.can D.must 3.If it were not for the fact that she_sing, I would invite her to the party. A.couldnt B.shouldnt C.cant D.might not,1.-I cant find my purse anywhere(08重庆) -You _ have lost it
5、 while shopping. A.may B.can C.should D.would 3.Liza_well not want to go on the trip -she hates traveling.(08全国卷II) A.will B.can C.must D.may,1.The teacher_have thought Johnson was worth it or she wouldnt have wasted time on him,I suppose.(07安徽) A.should B.can C.would D.must 2.In crowded places like
6、 airports and railway stations,You_take care of your luggage.(07北京) A.can B.may C.must D.will,must与 have to用法对比,must have to,1.表必须,(主观看法)必须; 没有过去式,可用于间接引语中. He told me I must do according to what he said.,(客观需要)不得不;有多种时态. -Its raining heavily, we cant go now. -I think well have to wait till the rain
7、 stops.,2.疑问句及答语中,Must I ? Yes, you must.(一定) No, you neednt. No, you dont have to,Do you have to go today? Yes, we do. 否定句: You dont have to worry about that.,You must be hungry now, _?,= Im sure you are hungry now.,He must be watching TV now, _?,= Im sure he is watching TV now.,Tom must have lived
8、 here for a long time, _?,= Im sure Tom has lived here for a long time.,She must have arrived yesterday, _?,= Im sure she arrived yesterday.,*陈述部分的must表示“一定”,“想必”等推测意义时,要根据陈述部分的不定式结构, 在附加疑问部分采用与其相适应的主动词或助动词形式.,arent you,isnt he,hasnt he,didnt she,1.-May I smoke here -If you _,choose a seat in the sm
9、oking section.(06山东) Should B. could C. may D.must 2.He_have completed his work; otherwise,he wouldnt be enjoying himself by the seaside. A.should B.must C.wouldnt D.cant 3.Tom, you_leave all your clothes on the floor like this!(05河南) A. wouldnt B.mustnt C.neednt D.may not,1.-Im sorry.I_at you the o
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