必修三Unit1 语法Festivals_around_the_world_grammar修改.ppt

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1、GrammarModalverbs情态动词Unit1Festivalsaroundtheworld主要情态动词Can,couldMay,mightMust/havetoNeedDareWill/wouldShall/should/oughttoWhatmodalverbshaveyoulearned?·情态动词的语法特征1） 情态动词本身具有一定的意义2）不能单独做谓语，不能独立使用。通常情况下，后面接动词原形，一起构成谓语3） 情态动词没有人称，数的变化4） 情态动词表示说话人的语气或情绪1)Som

2、eofuscanusethecomputernow,butwecouldn’tlastyear.2)Thenew-builttheatrecanseat1500people.3)Canshebeinthecomputercenter?4)Ithinkwhathesaidcannotbetrue.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could代替can使语气更委婉，回答时用can)

3、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’thavewrittena

4、reportlikethis.could+have+done表示对过去能做而未做的事情感到惋惜，遗憾;常译为本可以It’sapity.Yourclasscouldhavegotthefirstprize.Michael____beapoliceman,forhe’smuchtooshort.A.needn’tB.can’tC.shouldD.may2.Mr.Bushisontimeforeverything.How____itbethathewaslatefortheopeningceremony?A

5、.canB.shouldC.mayD.must3.----IstayedatahotelwhileinNewYork.----Oh,didyou?You____withBarbara.A.couldhavestayedB.couldstayC.wouldstayD.musthavestayedMysistermethimattheGrandTheateryesterdayafternoon,sohe____yourlecture.A.couldn’thaveattendedB.needn’thavea

6、ttendedC.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“mustnot/cannot”表“禁止，阻止”，不用“maynot”.Eg:---MayIwatchTVaftersupper?---Yes,youmay./No,youmustn’t.2.表示可能性。意为“或许，可能”might比may可能性小。Eg:1)Itmigh

7、tbetrue.2)Theymaynotbeinthelibrarynow.3.Mayyou+动词原形表“希望、祝愿、祈求”“祝你……”Eg:Mayyousucceed.1.Peter_____comewithustonight,butheisn’tverysureyet.A.mustB.mayC.canD.will2.Somepeoplewhodon’tliketotalkmucharenotnecessarilyshy；theyjustbequietpeople.A.mustB.mayC.shou

8、ldD.would3.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.用于表示意志或意愿。will指现在，而would指过去。Eg:1)I’llneverdothatagain.2)Theysaidthattheywouldhelpus.3)NomatterwhatIsaid,hewon’tlistentome.3.表