第十章情态动词不带to不定式的情态动词的6种形式以Will为例：与beableto的区别：can只有现在和过去时态，强调能力；beableto有各种时态，表示"一时"的能力，强调结果。Marycanplaythepiano.Shehasbeenabletoplayitsinceshewas5.YesterdayIwasabletogethomebeforetheheavyrain.mustShouldusedto与would的区别usedto表示过去情况与现在不同;would只单纯表示过去的情况need和dare用作情态动词时，主要用在否定句、疑问句中，用作实义动词时,可用于各种句式。NeedIcome?Yes,youmust./No,youneedn’t.Youneedn'ttelephonehimnow.Shedarenotgooutaloneatnight.Weshoulddaretogiveourownopinion.Weneedtotellthemthenews.注意：dare用作实义动词时，其否定句中的to可保留也可省略。Shedoesn'tdaretoclimbthetree.Shedoesn'tdareclimbthetree.二、情态动词的完成式和进行式modalverb+havedone:对过去发生的事情进行评价、猜测，表示“应当已经、想必已经、本来可以做但未做”Ishouldhavefinishedtheworkearlier.Heisn'there.Hemusthavemissedthetrain.Wherecan(could)hehavegone?Youcould(might)havebeenmorecareful.Yououghttohavecome,butwhydidn'tyou?modalverb+bedoing:对正在发生的事情进行评价、猜测，表示“想必正在、可能正在、应当正在”It's12o'clock.Theymustbehavinglunch.Theymaybediscussingtheproblem.Hecan'tbetellingthetruth.Sheshouldn'tbeworkinglikethat.Sheisstillsoweak.三、wouldrather和hadbetter的用法情态动词专项练习—Ihearyou'vegotasetofAustraliancoins.—Ihavealook?—Yes,certainly.A.DoB.MayC.ShallD.Should2.Heseldomlistenstoothers.Heanswerforwhathehasdone.A.shallB.willC.canD.would3.—MayIleavetheofficebefore5o'clockintheafternoon?—No,I'mafraidyou.A.needn'tB.shouldn'tC.mustn'tD.won't4.—ShallItellJohnaboutit?—No,you.Idon'tknowhistelephonenumber.A.needn'tB.wouldn'tC.mustn'tD.shouldn't5.MrBushisontimeforeverything.Howitbethathewaslatefortheopeningceremony?A.canB.shouldC.mayD.must6.Thetrafficlightisred,soIstopmycar.A.mustB.havetoC.canD.mustn't7.—Whathappenedtotheyoungtreesweplanted?—Thetreeswell,butIdidn'twaterthem.A.mightgrowB.needn'thavegrownC.wouldgrowD.wouldhavegrown8.Iwasreallyanxiousaboutyou.Youhomewithoutaword.A.mustn'tleaveB.shouldn'thaveleftC.couldn'thaveleftD.needn'tleave9.Tomshowhisexamresultstohisparents.A.darenotB.daredC.daretoD.daresnotto10.Shethefilm.Sheknowsnothingaboutit.A.can'tseeB.can'thaveseenC.mustseeD.mustn'thaveseen11.Theymusthavebeenh