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1、情態(tài)動(dòng)詞用法情態(tài)動(dòng)詞的語法特征2)情態(tài)動(dòng)詞不能單獨(dú)做謂語,后面只能接動(dòng)詞原形,oughtto和haveto除外,。3)情態(tài)動(dòng)詞沒有人稱,數(shù)的變化,但有些情態(tài)動(dòng)詞,如can、will、haveto、may等有過去式。1)情態(tài)動(dòng)詞表說話人的某種感情或語氣,對(duì)某一動(dòng)作或狀態(tài)的某種態(tài)度。1)Someofuscanusethecomputernow,butwecouldn’tlastyear.2)Canshebeinthecomputercenter?3)Ithoughwhathesaidcouldnotbetrue.4)
2、Can/CouldIuseyourdictionary?5)Couldyoulendmeahand?1.表能力,意為“能,能夠”,can指現(xiàn)在,could指過去。3.表示“請(qǐng)求”“允許”(表請(qǐng)求時(shí),口語中常用could代替can使語氣更委婉,回答時(shí)用can)2.表示推測(cè),意為“可能”“或許”,用于疑問句或否定句,can’t和couldn’t意為“不可能”。1.can與could4.can用于疑問句或否定句中時(shí),表驚異、不相信等,意思是“可能、能夠”。6)Howcanyoubelievesuchaliarlikeh
3、im?5.can’t/couldn’thavedone表示對(duì)過去情況的否定推測(cè),意為“過去不可能做過某事”7)Susancan’thavewrittenareportlikethis.8)Shecan’thavegonetoschool,itisSunday.6.can/couldhavedone表對(duì)過去的推測(cè),意為“過去可能做了某事”。couldhavedone還可以表示對(duì)過去能做而未做的事情感到惋惜,意為“本能夠做某事可事實(shí)上未做”9)It’sapity.Yourclasscouldhavegotthefir
4、stprize.10)WherecanMaryhavegone?can表示“能夠”時(shí)與短語beableto同義,但can只用于一般現(xiàn)在時(shí)或過去時(shí),而后者可用于各種時(shí)態(tài)。另外,can表示個(gè)人有某種能力,而beableto表示某人通過努力、克服困難做成某事,相當(dāng)于succeedindoingsth.;can/beabletoMichael____beapoliceman,forhe’smuchtooshort.A.needn’tB.can’tC.shouldD.may2.Mr.Bushisontimeforevery
5、thing.How____itbethathewaslatefortheopeningceremony?A.canB.shouldC.mayD.must3.----IstayedatahotelwhileinNewYork.----Oh,didyou?You____withBarbara.A.couldhavestayedB.couldstayC.wouldstayD.musthavestayedMysistermethimattheGrandTheateryesterdayafternoon,sohe____y
6、ourlecture.A.couldn’thaveattendedB.needn’thaveattendedC.mustn’thaveattendedD.shouldn’thaveattendedBAAA5.There’ssomeoneoutside.Who____itbe?A.canB.needC.mayD.must6.----IsJackondutytoday?----It____behim.It’shisturntomorrow.A.mustn’tB.won’tC.can’tD.needn’t7.Itisu
7、suallywarminmyhometown,butit____berathercoldsometimes.A.canB.needC.dareD.must8.Thefirespreadthroughthehotelveryquickly,buteveryone_______getaway.A.wereabletoB.wouldC.wasabletoD.couldACAC2.may與might1.表示“許可”或“請(qǐng)求”,有“可以”的意思,口語中常用might代may,表示委婉語氣。否定回答時(shí)用“mustnot”表“
8、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。意為“或許,可能”might比may可能性小。Eg:1)Thegirlmightbesle