情态动词 (2)

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,*,情态动词用法,情态动词的语法特征,1,）情态动词不能单独做谓语，除,ought,和,have,外，,后面只能接不带,to,的不定式。,2,）情态动词没有人称，数的变化，但有些情态动,词，如,can,、,will,也有一般式和过去式的变化。,3,）情态动词的“时态”形式并不是时间区别的主要标,志，不少情况下，情态动词的现在式形式和过去,式形式都可用来表示现在时间、过去时间和将来,时间。,will,和,would,：,1.would,表示过去的习惯性,One day a week he _spend a whole day in silence.,would,2.,will,和,would,表示意愿、意志，可用于各种人称,If you _help me with my English,I _ be very happy.,I promised that I _do my best.,will,will,would,used to,3.,在疑问句中用于第二人称，提出请求或询问。,_you tell her that Im here?,If you want help-let me know,_you?,_you type this,please?,_ you sit down?,_you help us,please?,would,比,will,客气委婉,Will,will,Will,Wont,Would,can 和could,：,_,you offer me some kind of job?,_ I help you?,_ you ride a bike?,_ he be at home?,How _ you say that?,I _ say that he has finished his work.,Can/Could,Can,Can,Can/Could,could,cant,1,请求、允许,2,主动提供帮助,3,能力,4,可能性,5,责备,6,预言、预测,can 和could,：,can,could,表能力和,be able to,的区别,She,can/is able to,sing the song in English.,This machine,can,make you feel comfortable.,1 can,的主语是人或物,be able to,的主语是人,We,ll be able to,finish the work soon.,I,havent been able to,see the film.,2,can,只用于现在式和过去式,(could,beableto,可以用于各种时态。,3 be able to,表做成了某事,may 和might,：,1.,表示说话人的猜测,/,可能性,:,通常只用于,肯定句,和,否定句,中。,-_I use your pencil?,-Yes,you_./No,you_.,2.,may,和,might,用于一般问句中表示委婉的请求,肯定回答用,may,否定用,mustnt,May,may,mustn,t,3.,表示祝愿,;,但语气较正式,:,May,you succeed!,May,you have a good journey!,May+,sb,.+do!,shall,和,should,：,should,表示义务、建议、劝告，意为“应该”。,“,should+have+,过去分词”,表本应该在过去做但没做,。,You,should,keep your promise.,She,should,have passed the exam.,_I open the window for you,？（,征求意见）,_he fetch some water for you,？（,请求）,2.,在疑问句中,用于第一、三人称，用来表示请求或征求意见。,Shall,Shall,shall,和,should,：,You,shall,do as I say.,Tell him that he,shall,have the book tomorrow.,Nothing,shall,stop me doing it.,3.,shall,用于第二、三人称表示允诺、警告、命令、决心等。,must,的主要用法：,We,must,all die.,You,must,get up early.,He,must,be crazy.,1.,表示必然性。,2.,表示强制或者义务。,3.,表示推测，语气非,常肯定，近乎确定的,意味，一般用在肯定句。,注意,:,1 must not,的意思是不许可，不应该或者禁止。,We,mustnt,waste our time.-May I take this magazine out?-No,you,mustnt,.,2 must,用于一般疑问句的时候，肯定回答应该用,yes,please,或者,Im afraid so,其否定回答应该用,neednt,或者,dont have to,。,如：,归纳：,表可能、猜测,2,）,can,一般用于,疑问句,、有把握的,否定,推测,may/might,用于没有把握的,肯定,、,否定,推测,must,用于有确切把握的,肯定句,3,）对现在、未来推测：,+,do,对过去推测：,+,have done,对此刻正在发生的事情推测,:+,be doing,1,）,must/can/could/may/might(,强 弱,),语气,4)should,(,大概、按理应当,),;,will,(,很可能、准会,),也可表推测，一般只用于,肯定句,2.A:_ Xiao,Feng,find the origin of Easter from that book?,B:No,he _.,1.A:_ you like to go to a special event with us on Saturday?,B:Yes,I _ _.,Would,d like to go with you on,Saturday,Could,couldnt find it,Exercise,3.A:_ I go with my friend to the harvest festival?,B:Yes,you _ _.,4.A:If I want to be a doctor _ I study science?,B:Yes,you _.,should study science,May,may go(with your,should,friends),5.A:He is very handsome._ he play the role of the prince?,B:No,he _ _.,cant play the role of the,Can,prince,6.A:The,neighbour,s children are older this year._ they stop playing tricks at Halloween?,B:Perhaps,they _ _.,_,_.,Might,or Should,might stop,or should stop playing tricks,playing tricks at Halloween,at Halloween,-_ I go out to play,mum?,-No,you_.You should do your,homework first.,A.Might;wouldnt,B.May;had better not,C.Must;mustnt,D.Need;mustnt,B,Practice,2.-Where is Emma?,-I cant say for sure where she is,but she_ be out shopping.,A.can,B.should,C.must,D.may,D,3.The room is in a terrible mess;it,_ cleaned.,A.cant have been,B.couldnt be,C.may have been,D.would be,A,4.How _ you say that you really,understand the whole story if you,have covered only part of the article?,A.can,B.must,C.need,D.may,A,5.There _ be any difficulty about,passing the road test since you have,practised,a lot in the driving school.,A.mustnt,B.shant,C.shouldnt,D.neednt,C,Exercise,I,单句改错,1.Mr.Smith looks pale.He,can,be ill.,2.When we worked in the same office,we,will,often have coffee together.,3.You,must,be joking.That,mustn,t,be true.,4.Come to take the photos tomorrow morning.,It,may,be ready by then.,5.The fire spread so fast that only one-third,of the people,could,escape the fire.,may,would,cant,should,were able to,II,用正确的情态动词填空。,1.,When we are cooking with a gas fire,we,_(can/must)keep the window open.,2.Mr.Joseph has stayed in the US for several,years.He _(may/can)speak,English quite well.,3.No one _(will/would)think of,wearing a long coat in summer.,4.It _(cant/,mustn,t)be Miss,Gao,.I,know she has gone to Beijing.,5.You say you _ not do it but I say,you _(shall/will).,must,can,would,cant,will,shall,