高中英语语法精讲之情态动词课件.ppt

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1、GrammarModalverbs一.Weusemodalverbstotalkabout:1.Ability（能力）2.Obligation（义务）3.Certainty（可能性）4.Permission（允许）二.Wealsousemodalverbsto:5.Makerequests（提出请求）6.Makesuggestions（提出建议）7.Makeoffers（提供帮助）8.Giveadvice（提出意见）1.Ability(能力):LiuXiangcanrunthe110mhurdlera

2、cewithin13seconds.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.canMancannotlivewithoutair._______Iuseyourbike?Cancan/could:2.在疑问句中，用could可表示请求，语气较委婉。—____Ihavethetelevisionon?—Yes,you_____./No,you_____CouldHeasksifhe___

3、_smokehere.couldcan/maycan’t/I’mafraidnotcan/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）He’ssuchanicepersonthathe______committhecrime.can’t你怎么会如此地粗心！Howcanyoubesocareless!Canthisbetrue?can/could:4.cannever/can’t……too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。You

4、can’tbetoocarefulwhilecrossingtheroad.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，

5、能做到的事情。Attention:can/beableto区别:AbigfirebrokeoutinABChotelyesterday.Luckily,everyone__________runoutofthebuilding.wasableto2.She_____speakbothEnglishandFrench.canI’msotired!Ihavetodothetrainingforatleast10hoursaday!2.Obligation(义务):…yethemustworkhardtow

6、inthegoldmedal.AlthoughLiuXiangissogiftedinhurdlerace…Attention:advisabilitynecessityoughtto/shouldhavetomustYourmotherbringsyouupandtakesgoodcareofyou,sowhensheisold,you___lookafterherinreturn.A.canB.mayC.havetoD.mustShiDongpengmightwinamedalattheOlymp

7、icGames.Althoughthechanceofwinningamedalissmall,I’lltrymybest!3.Certainty(可能性):Attention:veryuncertainalmostcertainmightshouldmustmaycouldoughttowill1.He_____beathome.2.He_____beathome,forhejustcalledmefromhishome15secondsago.A.mayB.mightC.mustA.mayB.mi

8、ghtC.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.mustmust2.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___bed