新人教必修3 Unit1 Festivals around the world[情态动词]

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1、情态动词表说话人的某种感情或语气，对某一动作或状态的某种态度。表示“需要、可以、必须、应当”等。情态动词(modalverbs)1)Someofuscanusethecomputernow,butwecouldn’tlastyear.2)Thenew-builttheatrecanseat1500people.3)Canshebeinthecomputercenter?4)Ithoughwhathesaidcouldnotbetrue.5)Can/CouldIuseyourdictionary?6)Couldyoulendmeahand?1.表能力3.表示“请求”“允许”(表请求时，口语中常用

2、could代替can使语气更委婉，回答时用can)2.表示推测，意为“可能”“或许”，用于疑问句或否定句1.can与could4.表示“许可”，可与may换用。Youcangohomenow.5.can用于疑问句或否定句中时，表惊异、不相信等，意思是“可能、能够”。HowcanyousaythatyoureallyunderstandthewholeStoryifyouhavecoveredonlypartofthearticle?6.can’t/couldn’t+have+done表示对过去情况的否定推测Susancan’thavewrittenareportlikethis.7.could

3、+have+done表示对过去能做而未做的事情感到惋惜，遗憾It’sapity.Yourclasscouldhavegotthefirstprize.Michael____beapoliceman,forhe’smuchtooshort.A.needn’tB.can’tC.shouldD.may2.Mr.Bushisontimeforeverything.How____itbethathewaslatefortheopeningceremony?A.canB.shouldC.mayD.must3.----IstayedatahotelwhileinNewYork.----Oh,didyou?Y

4、ou____withBarbara.A.couldhavestayedB.couldstayC.wouldstayD.musthavestayedMysistermethimattheGrandTheateryesterdayafternoon,sohe____yourlecture.A.couldn’thaveattendedB.needn’thaveattendedC.mustn’thaveattendedD.shouldn’thaveattendedBAAA2.may与might1.表示“许可”或“请求”，有“可以”的意思，口语中常用might代may,表示委婉语气。否定回答时用“mus

5、tnot”表“禁止，阻止”，不用“maynot”.“maynot”表示“可能不”。Eg:1)---MayIwatchTVaftersupper?---Yes,youmay./No,youmustn’t.2)TodayisSunday.Shemaynotinherofficenow.2.表示可能性。意为“或许，可能”might比may可能性小。Eg:1)Itmightbetrue.2)Theymaybeinthelibrarynow.3.may/mightaswell+动词原形“…还是…的好”Eg:Youmayaswellgoandhavealook.4.Mayyou+动词原形表“希望、祝愿、祈

6、求”“祝你……”Eg:Mayyousuccess.1.SorryI'mlate.I_____haveturnedoffthealarmclockandgonebacktosleepagain.A.mightB.shouldC.canD.will2.Peter_____comewithustonight,butheisn’tverysureyet.A.mustB.mayC.canD.willAB3.will与would1.表“请求、建议”等，用would比用will委婉，客气些Eg:1)Willyoulendmeyourbook?2)Wouldyoulikeacupoftea?2.用于表示意志或

7、意愿。will指现在，而would指过去。Eg:1)I’llneverdothatagain.2)Theysaidthattheywouldhelpus.3.表示习惯性动作。译作“总是、惯于”will指现在，would指过去。Eg:1)Hewilloftenreadallnight.2)Fishwilldiewithoutwater.3)Everyevening,shewouldsitbywind