Grammar:ModalModalverbsverbs•情态动词有一定的意义•无人称和数的变化•通常不带to•表示说话人的语气或情绪语法特征语法特征1.Ability(能力):LiuXiangcanrunthe110mhurdleracewithin13seconds.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____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。Youcan’tbetoocarefulwhilecrossingtheroad.can/beableto区别:Edisonalwayswonderedwhyhenscouldhatch(孵)chickenswhilehewasnotableto.Question:Arethetwomodalverbsinterchangeable(互换)?Ifnot,why?can表示与生俱来的能力与生俱来的能力或一种客观可能一种客观可能，而beableto更加强调通过后天的学习和努力获得通过后天的学习和努力获得的能力，的能力，或者在某个客观的场合和背景下在某个客观的场合和背景下，能做到的事情。Sumup1.can和beableto1)can(could)表示能力、可能,只用于现在时和过去时。2)beableto可以用于各种时态。只用beableto的情况：a.位于助动词后。b.情态动词后。c.表示过去成功地做了某事时,只能用was/wereableto,不能用could。can/beableto区别:1.AbigfirebrokeoutinABChotelyesterday.Luckily,everyone__________runoutofthebuilding.wasableto2.She_____speakbothEnglishandFrench.canTheywill______runthismachineontheirowninthreemonths.A.canB.couldC.mayD.beabletoThatbigcinema______seat2,000people.A.canB.shouldC.oughttoD.isabletoDA3.(2007福建)MyMP4playerisn’tinmybag.Where___Ihaveputit?A.canB.mustC.shouldD.wouldA4.Aleft-luggageofficeisaplacewherebags____beleftforashorttime,especiallyatarailwaystation.A.shouldB.canC.mustD.willB5.How___yousaythatyoureallyunderstandthewholestoryifyouhavecoveredonlypartofthearticle...
