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Unit2GrammarandUsage,Modalverbs,can/could:,1.can一般表示与生俱来的能力或者一种客观可能性,还可以表示请求和允许。,LearningEnglish_bedifficult.,can,Mancannotlivewithoutair.,_Iuseyourbike?,Can,can/could:,2.在疑问句中，用could可表示请求，语气较委婉。,_Ihavethetelevisionon?Yes,you_./No,you_,Could,Heasksifhe_smokehere.,could,can/may,cant/Imafraidnot,can/could:,3.表示惊异、怀疑、不相信的态度。（主要用在否定句、疑问句或惊叹句中）,Hessuchanicepersonthathe_committhecrime.,cant,你怎么会如此地粗心！,Howcanyoubesocareless!,Canthisbetrue?,can/could:,4.cannever/canttoo表示“无论怎样也不过分”，“越越好”。,你过马路的时候再小心也不为过。,Youcantbetoocarefulwhilecrossingtheroad.,Attention:,can/beableto区别:,Edisonalwayswonderedwhyhenscouldhatch(孵)chickenswhilehewasnotableto.,Question:Arethetwomodalverbsinterchangeable(互换)?Ifnot,why?,can表示与生俱来的能力或一种客观可能，而beableto更加强调通过后天的学习和努力获得的能力，或者在某个客观的场合和背景下，能做到的事情。,Attention:,can/beableto区别:,AbigfirebrokeoutinABChotelyesterday.Luckily,everyone_runoutofthebuilding.,wasableto,2.She_speakbothEnglishandFrench.,can,Attention:,advisability,necessity,oughtto/should,haveto,must,Yourmotherbringsyouupandtakesgoodcareofyou,sowhensheisold,you_lookafterherinreturn.,A.canB.mayC.havetoD.must,Attention:,veryuncertain,almostcertain,might,should,must,may,could,oughtto,will,1.He_beathome.,2.He_beathome,forhejustcalledmefromhishome15secondsago.,A.mayB.mightC.must,A.mayB.mightC.must,(can),must表示肯定的猜测，译为“一定”，不能用于否定句或疑问句。Thismustbeyourpen.Hemustbedoinghishomeworknow.Hemusthavearrivedalready.,must,must,2.表示“坚持”（常用于固定句型：ifyoumustdosth.如果你非得要做某事）,如果你真的要走，那就悄悄离开。,Ifyoumustleave,doitquietly.,Attention:,They_bedoingtheexperimentinthelab.Why？Becausethelightsarestillburning.,A.couldB.canC.mustD.would,may/might:,1.表示许可。表示请求、允许时，might比may的语气更委婉一些。,Might/MayIuseyourcomputer?Yes,youcan./No,youcant/mustnt.,may/might:,2.用于祈使句中表示祝愿。,3.表示推测、可能（只用于肯定句，疑问句则要用can或could）。,祝你成功！,Mayyousucceed.,Hemaybeverybusynow.,Mayyoubehappyallyourlife.,5.Makingrequests(提出要求):,Canyouhelpmewithmytraining?,Idontknowhowtousethisequipment!,willcancouldwould,informal,formal,6.Makingsuggestions(提出建议):,Shallwedothetraininginthemorning?,Itstoohottotakeexerciseintheafternoon.,shall:,1.Shall用于第一、第三人称疑问句中，表示说话人征求对方的意见、向对方请示或提供帮助。,1.Shallwebeginourlesson?2.Whenshallhebeallowedtoleavehospital?3.ShallIcarrythisbagforyou?,shall:,2.Shall用于第二、第三人称，表示说话人给对方命令、警告、允诺或威胁。,Youshallfailifyoudontworkharder.Heshallbepunishedaccordingtotherule.等我读完这本书，就会给他的。,HeshallhavethebookwhenIfinishit.,警告,威胁,允诺,7.Makingoffers(提供帮助):,Dontworry,dear,Iwillwashthemrightaway.,Mom,mydirtyclotheshavebeenpiledup!Idonthavetime,will/would:,1.表示请求、建议等，would比will委婉客气。,sentencepattern,Wouldyouplease,Wouldyoumind,Wouldrather,Wouldyoulike,will/would:,2.表示意志、愿望和决心。,Iwillneverdothatagain.,will/would:,3.可表示经常性、习惯性、倾向性。翻译为“经常、惯于、总是”。,1).Theoldman_haveasmokeunderabigtreeeveryafternoonafterhefinishedhisfarmwork.,would,2).门就是打不开!,Thedoorwontopen.,will/would:,Attention:,Iwillgototheparkwithyoutomorrowifyouwilloffermelunch.,Question:Isthissentencecorrect?Why?,情态动词,表示“意愿”,should:,1.Should表示劝告、建议、命令，其同义词是oughtto；在疑问句中，通常用should代替oughtto。,ShouldIopenthewindow?,我们应当要相互学习。,Weshouldlearnfromeachother.,should:,2.情态动词should用于第一人称时可以表示说话人的一种谦逊、客气、委婉的语气。,RoseSure.Bytheway,whoisyouridol?JackLiuXiang,Ishouldsay.,Ishouldadviseyounottodothatagain.,3.should表示意外或惊讶常译为“居然，竟然”。Icantbelievesuchagentlemanshouldbesorudetotheold.我不敢相信这样一个绅士居然对老人如此无礼。,should:,4.should表示猜测时，一般指按经验或逻辑判断，翻译成“照说应该，估计，想必”,should:,-WhencanIcomeforthephotos?Ineedthemtomorrowafternoon.-They_bereadyby12:00.A.canB.shouldC.mightD.need,Tobecontinued,三.“情态动词+havedone”的用法,（1）musthavedone对过去某事的十分肯定猜测（2）may/mighthavedone对过去某事的可能性猜测（3）cant/couldnthavedone对过去某事的否定猜测（4）should/oughttohavedone过去应该做而未做（5）shouldnt/oughtnttohavedone过去不应该做而实际上做了（6）neednthavedone本没有必要做的事实际却做了（7）couldhavedone本来能够做的（有能力做）事实际却未做到,Letshaveatry!,Practice,Withsomuchworkonhand,you_toseethegamelastnight.A.mustntgoB.couldhavegoneC.shouldntgoD.shouldnthavegone,2.Therewasplentyoftime.She_.A.mustnthavehurriedB.couldnthavehurriedC.mustnothurryD.neednthavehurried,Practice,3.IsawMaryinthelibraryyesterday.-You_her.Sheisstillabroad.A.mustntseeB.canthaveseenC.mustnthaveseenD.couldntsee,4.AuntMary_thetrain,otherwiseshewouldhavearrivedherebynow.A.musthavemissedB.shouldhavemissedC.hadmissedD.mightmiss,四.可兼做行为动词的情态动词：need、dare,情态动词(+动词原形),行为动词,need,dare,1.无人称和数的变化;,2.尤其用于：,*否定句及疑问句中;,*在if/whether之后;,*或与hardly,never,noone,nobody连用;,3.常以neednt和darent的形式出现;,4.dare有其过去时dared.,多用于肯定句;(sb.)needtododaretodo(sth.)needtobedone(sth.)needdoing,HedarentspeakEnglishbeforesuchacrowd,darehe?,判断正误:,HedarenttospeakEnglishbeforesuchacrowd,didhe?,Thesedishesneedbecleanedcarefully.Thesedishesneedtobecleanedcarefully.Thesedishesneedcleaningcarefully.,五.表示否定的情态动词的用法:部分情态动词的否定式是情态动词中的考点之一。,mustnt不准,禁止neednt没必要(=donthaveto)cant不能;不可能maynot不可以;可能不shouldnt不应该(=oughtnotto),Thankyou!,
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