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1、情态动词情态动词2dare,need的用法的用法可兼做行为动词的情态动词：可兼做行为动词的情态动词：need、dare 1.作情态动词用时，常用在否定句和疑问句中。作情态动词用时，常用在否定句和疑问句中。S+neednt+VNeed+S+V?Youneedntreturnthebooknow.-Needhedoitallatonce?-Yes,hemust.-No,heneednt/doesnthaveto.need的用法的用法2.作实义动词用作实义动词用, 有人称、时态、和数的变化。有人称、时态、和数的变化。Heneedstogotherehimself.Hehasgrownup,wedon
2、tneedtoworryabouthim.Doyouneedtogonow?3.(sb.)needtodosth.sb./sth.need(want,require)+doing/tobedoneWeneedtoknowtheanswer. Thehouseneedscleaning/tobecleaned.Theboyneedssendingtothehospitalatonce.1.作情态动词时，主要用在否定句，疑问作情态动词时，主要用在否定句，疑问句及条件句中。句及条件句中。S+darent+Vdare+S+V?Idarentwalkthroughtheforestatnight.Dar
3、eyouwalkthroughtheforestatnight?Ifyoudaregoout,Iwillkillyou.dare/dared的用法的用法2.作实义动词用作实义动词用,有人称、时态、和数的变有人称、时态、和数的变化。常见用法是化。常见用法是daretodo,但但在否定句和在否定句和疑问句中，疑问句中，daretodo中的中的to可以省略。可以省略。Idaretoswimacrossthisriver.Hedoesnotdare(to)answer.Dontyoudare(to)touchit?情态动词情态动词+havedone这是历年高考热点之一，这是历年高考热点之一，表示现在对
4、表示现在对过去过去事物的推测，事物的推测，有有 “推测、责备、怀疑推测、责备、怀疑”等多种意义。等多种意义。一、表示对过去事情的推测或估计一、表示对过去事情的推测或估计1.musthavedone“一定已经一定已经”eg:Thegroundisratherwet,soitmusthaverainedlastnight.2.may/mighthavedone“可能可能/大概已经大概已经”eg:Tommayhavegonetoshanghai,butIamstillnotsureaboutit.3.cant/couldnthavedone“不可能已经不可能已经”eg:Thegroundisvery
5、dry,soitcanthaverainedlastnight注：在疑问句中注：在疑问句中can/could表示对过去情况的疑问性表示对过去情况的疑问性推测，推测，“可能已经可能已经？”eg:Someonemusthavebrokenintoourbedroom.Whocouldhavedoneit?二、表示对过去所发生事情的遗憾或责备二、表示对过去所发生事情的遗憾或责备1.should/oughttohavedone“本该做却没做本该做却没做”eg:IreallyregrettedwastingthehourswhenIshouldhavestudiedhard,butitwastoolat
6、e.2.shouldnt/oughtnttohavedone“本不该做却做了本不该做却做了”eg:ImverysorryforthewordsIshouldnthavesaidtoyouatthatmoment.3.could/mighthavedone“本可以做却没做本可以做却没做”eg:Hecouldhaveworkedouttheproblem.4.neednthavedone“本不必做却做了本不必做却做了”eg:Yourhomeisnotfarfromyourschool,soyouneednthaveleftinsuchahurry.5.wouldratherhavedone“本想做
7、却未做成本想做却未做成”eg:IwouldratherhavecometohelpyouwithyourEnglish,butIwastoobusyatthattime.1.Theriverisrising.It_lastnight.A.mustberainingB.mustrainC.mighthaverainedD.musthaverained2.Ididnthearthephone.I_asleep.A.mustbeB.musthavebeenC.shouldbeD.shouldhavebeen3.-WedidntseeTomatthemeetingyesterday.-Heit.A.m
8、ustnthaveattendedB.cannothaveattendedC.neednthaveattendedD.wouldnothaveattended4.-Therewerealreadyfivepeopleinthecar,buttheymanagedtotakemeaswell.-It_acomfortablejourney.A.cantbeB.shouldntbeC.mustnthavebeenD.couldnthavebeen5.Youyesterdayifyouwerereallyseriousaboutyourwork.A.oughttocomeB.oughttobecom
9、ingC.oughttohavecomeD.oughthavecome6.You_alltheseparcelsyourself.Theshopwouldhavedeliveredthemifyouhadaskedashopassistant.A.didntneedtocarryB.neednthavecarriedC.needntcarryD.didntneedcarry7.Mr.White_at8:30forthemeeting,buthedidntshowup.A.shouldhavearrivedB.shouldarriveC.shouldhavehadarrivedD.shouldbearriving8.IlltellMaryabouthernewjobtomorrow.You_herlastweek.A.oughttotellB.wouldhavetoldC.musttellD.shouldhavetold补充：补充：1.Letsdosth,shallwe?Letusdosth,willyou?2.Pleasedosth,willyou?Pleasedontdosth,willyou?3.hadbetterdosth.wouldratherdosth.
