情態動詞的用法,1,1、CouldIborrowyourbook?Yes.Ofcourseyoucan.2.Wouldyouliketodoitforme?Yes.Iwould.,一、情態動詞注意事項,2,(1)對現在或將來情況推測：must+動詞原形。must只能用于肯定。否定和疑問分別用cant和can。Hemusttellalie.Canhetellalie?Hecanttellalie.*Must-should/oughttomay-might/could+do可能性依次減弱,2、推測語氣,3,(2)對過去情況推測：must(may,might)+完成時。Youmusthavemethimbefore.mustmaymight可能性依次減弱must只能用于肯定句，譯成“一定”。否定和疑問分別用cant/couldnt和can/could。Could/Canithavehappenedlastnight?Itcouldnt/canthavehappenedlastnight.,4,Hemustbereading,isnthe?Youmustdoityourself,dontyou?Hemusthavegoneoverthearticle,hasnthe?Itmusthaverainedlastnight,didntit?,3、表猜測語氣的反意疑問句的構成,5,wouldneedusedtododaremustntdonthaveto=needntmay/mightdo/havedone不妨;還是為好,4、beabletomustcanhaveto,6,1）用于第一人稱表將來。IshallgotoworkafterIhavefinishedschool.2）用于一、三人稱疑問句、表征求對方意見或向對方請求。Shallhecomein?Comein,please.3）用于二、三人稱，表示保證、承諾、威脅、警告。Youshallbepunishedifyouinsistondoingitthisway.,5、Shall,7,1）預測、可能。Theyshouldbeherebynow.2）說話人的感情。如驚奇、憤怒、失望等、“竟然”Youcantimaginethatwell-behavedgentlemanshouldbesorudetoalady.,6、should,8,1）對過去情況推測。must/may/mighthavedonecant/couldnt/maynot/mightnothavedonecan/couldhavedone?,7、情態動詞+havedone,9,2）譯成“本”could/should/needhavedone.Youshouldhavecomeherefiveminutesearlier.3）虛擬語氣（與過去事實相反的主句）Ifyouhadfollowedmyadvice,youwouldnthavebeendefeated.,10,情態動詞典型例題專練,11,1.-Therewerealreadyfivepeopleinthecarbuttheymanagedtotakemeaswell.-It_acomfortablejourney.()cantbeB.shouldntbeC.mustnthavebeenD.couldnthavebeen,D,12,2.Johnny,you_playwiththeknife,you_hurtyourself.()wont;cantmustnt;mayC.shouldnt;mustD.cant;wouldnt,B,13,3.Thefirespreadthroughthehotelveryquicklybuteveryone_getout.()hadtoB.wouldC.couldD.wasableto,D,14,4.-WhencanIcomeforthephotos?Ineedthemtomorrowafternoon.-They_bereadyby12:00.()A.canB.shouldC.mightD.need,B,15,5.Withsomuchworkonhand,you_toseethegamelastnight.()mustntgoBshouldntgoC.couldhavegoneD.shouldnthavegone,D,16,6.TheyaredisappointedattheEnglishparty.Theysaythatit_betterorganized.()hadbeenB.hadtobeC.musthavebeenD.couldhavebeen,D,17,7.Shemusthaveforgottenabouttheclass_?()doesntsheB.mustntsheC.hasntsheD.wontshe,C,18,8.Seewhosthere!_itbeMary?MayMustCanwill,C,19,9.Jenny_withhimatthattime,forIwashavingdinnerwithherinmyhome.()canthavebeenB.mustnthavebeenC.mustbeD.maybe,A,20,10.Tomsfatherpromised,“You_haveanewcomputerifyoupassthecomingexamination,”()canB.shouldC.shallD.may,C,21,11.-Didyouwalkedhomebyyourselflastnight?-Yes,Idid.ButIthinkI_.()needntB.shouldntC.maynothaveD.neednthave,D,22,12.-Wouldyouchangethisbucketforanother?It_holdwater.-OK.Imreallysorry.wontcantdidntdoesnt,A,23,13.YououghttohavehelpedhimwithhisEnglish,_you?A.wontyouB.oughtnotyouC.shouldntyouD.wouldntyou,C,24,14.-IthoughI_somethingburning.()-Rea