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1、情态动词can和couldcan/could表示能力，只用于现在式和过去式(could)。beableto2.can表示客观可能性.Anybodycanmakemistakes.Itcanbecoldinwinterinthesouth.3.表示许可.Youmay/cancomein.4.用在否定句或疑问句中,表猜测,怀疑,惊讶Thatcan’tbeTom.HewenttoLondontwoweeksago.Thefirespreadthroughthehotelveryquicklybuteveryone____geto
2、ut.(NMET97)AhadtoBwouldCwasabletoDcouldCHecouldswimacrosstheEnglishChannel.Buthedidn’tfeellikeitthatday.(能力）YesterdayIwasabletogethomebeforetheheavyrain.Beabletodosth=managetodosth=succeedindoingsth1.表示允许或请求canmay/canIhelpyou?2.没有把握的推测。Shemaycometomorrow.Shemaynot
3、(可能不）gotothepartytonight.3.放在句首,表示祝愿。MayGodblessyou!might表示推测时,不表示时态,只是可能 性比may小。Theymightbehavingameeting,butI’mnotsure.may和might---AreyoucomingtoJeff’sparty?------I’mnotsure.I___gototheconcertinstead.(NMET00)AmustBwouldCshouldDmightD---IsJohncomingbytrain?---Hes
4、hould,buthe__not.Helikesdrivinghiscar.(NMET02)AmustBcanCneedDmayDPeter___comewithustonight,butheisn'tverysureyet.A.must B.may C.can D.will答案B.表可能性只能用may.此句意可从后半句推出。I’msurehe___havethecomputersoonerorlater.AshallBcanCmustDwouldChaveto和must“必须”1.haveto表示由于客观因素不得不做m
5、ust表示说话人的主观意志,看法Mybrotherwasveryill,soIhadtocallthedoctorinthemiddleofthenight.Hesaidthattheymustworkhard.2.haveto有人称、数、时态的变化，而must只有一种形式。Hehadtolookafterhissister yesterday.3.否定结构中don’thaveto表示“不必”mustn’t表示“禁止”Youdon’thavetotellhimaboutit.你没必要把此事告诉他。Youmustn’ttel
6、lhimaboutit.你一定不要把这件事告诉他。4.–MustIreturnthebooktoday?-Yes,youmust.-No,youneedn’t./No,youdon’thaveto.NeedIcallheragain?---Yes,you_____.---No,you_______.mustneedn’tdon’thavetoMayIuseyourbicycle?---Yes,you_____.---No,you_______.maycan’t---MayIuseyourmotorbike?---No,yo
7、u___.Acan’tBshouldn’tCneedn’tDmustn’tA–MayIleavenow?-Yes,youmay.-No,youmustn’t.Wemustgonow,______?---Mustwegonow?---Yes,you______.---No,you_________.needn’tyoumustneedn’tdon’thaveto1.will在疑问句中表示请求和建议.would比will更婉转,礼貌Willyoucometomyoffice?2.表示愿意去做某事或决心做某事.Iwillmarr
8、yyou.Ifyouwillcometotheparty,wewillbeveryhappy.作为情态动词will可以用于条件状语从句will和wouldwould和usedto1）usedto表示过去与现在或过去某时与后来的情况有不同，而would只表过去的情况(过去往往)。Peopleusedtot
