情态动词的语法特征情态动词的语法特征•情态动词除ought和have外,后面只能接不带to的不定式。•情态动词没有人称,数的变化,即情态动词第三人称单数不加-s。•情态动词没有非谓语形式,即没有不定式,分词等形式。情态动词的形式现在时过去时maymightcancouldmust(hadto)oughtto--willwouldshallshouldneed--daredared--usedto•Twoeyescanseemorethanone.•IamsostrongthatIcanliftthisstone.•HesaidthatJackcouldn’tfinishhisworkinsuchashorttime.•Couldyoufollowmystep?•Heisonlyfour,butheisabletoread.•Shewasabletodoitwithoutmyhelp.•Willyoubeabletocometomypartytomorrow?表能力表能力cancouldbeableto有时态变化有时态变化•Youcangonow.•Iwon’tletyoudown.•CouldIsayitinChinese?•MayIknowyourname?•Wouldyoumindclosingthedoor?•Shallwedance?•MightIhaveawordwithyou?语气强弱表许可,征询意见can,willcould/may/would/shall/might•Theremustbeamistake.•Youmaywalktenmileswithoutseeingahouse.•Hemightgetthereontime.•Itcanbetrue.•Inthosedaysfewworkerscouldsupporttheirfamilies.表可能性(猜测)mustmay,might,can,could在肯定句中语气强弱语气强弱•Shecan’tbeserious.•Wecouldn’thavedonebetter.•Peoplemaynotpickflowersinthisgarden.•Shewasafraidtheymightnotliketheidea.表不可能表不可能((猜测猜测))can’t,couldn’tmaynot,mightnot在否定句中mustn’t,shouldn’thadbetternot•Wemustn’twasteourtime.•Theyshouldn’tleftsosoon.•You’dbetternotdisturbhim.表禁止•Youshoulddowhatyourparentstellyou.•Ifyoucan’tfinishthebookbythen,youmustcomeandrenewit.•Thisisalovelyparty,butwehavetogobecauseofthebaby-sister.•Thebridgewasnotwideenoughsothatsomebodyhadtogiveway.should,musthaveto表义务(应该)有时态变化翻译下列句子,注意情态动词的不同用法:1.Tom,youmustn’tleaveallyourclothesonthefloorlikethis!2.Hemusthavecompletedhishomework;otherwise,hecouldn’tbeenjoyinghimselfbytheseaside.(表示禁止,意为“不许”)(must+have+过去分词,表示对过去事情肯定的推测)3.Helenmaygoonthetripwithus,butsheisn’tquitesureyet.4.---Isn’tthatAnn’shusbandoverthere?---No,itcan’tbehim—I’msurehedoesn’twearglasses.(表示可能性,意为“可能”)(对现在的否定性推测,意为“不可能”)5.Ioftenseelightsinthatemptyhouse.DoyouthinkIshouldreportittothepolice?6.Childrenunder12yearsoldinthatcountrymustbeunderadultsupervisionwheninapubliclibrary.(表示应该)表示义务或必要,意为“必须”7.---Whoisthegirlstandingoverthere?---Well,ifyoumustknow,hernameisMabel.8.---I’lltellMaryabouthernewjobtomorrow.---Youshouldhavetoldherlastweek.表示主张,意为“一定要”表示与过去事实的相反,意为“本应该……”9.Youcan’timaginethatawell-behavedgentlemanshouldbesorudetoalady.10.Theinterestshallbedividedintofiveparts,accordingtotheagreementmadebybothsides.表示吃惊,意为“竟然会”(表示义务或规定)11.---IsJohncomingbytrain?---Heshould,buthemaynot.Helikesdrivinghisowncar.12.Sinceitisraining,wehavetostayindoors.13.Imustgonow.TherearealotofthingsIwanttodo.(表示对现在或将来的推测)(表客观需求)(强调主观意图)14.Theremustbesomereasonforhisabsence.15.---NeedIdotheexperimentagainafterclass?---Yes,youmust.(No,youneedn’t/don’thaveto.)(表示对现在的肯定性推测)need引起的疑问句肯定回答用must.Practice1.—Thatmustbeamistake.—No,it_____amistake.A.mustnotbeB.needn’tbeC.cannotbeD.wouldnotbe2.—_____IwaterthetreesonTuesday?—No,youneedn’t.A.CanB.MustC.MayD.Shall3.He_____notpayunlessheispunishedtopay.A.shallB.willC.canD.would4.I_____suchamistakeagain.A.shallnevermakeB.maynevermakeC.canneverdoD.needneverdo5.—_____Iturnontheradio?—You’db...
