资源描述：
《情态动词can和could的用法.ppt》由会员上传分享，免费在线阅读，更多相关内容在行业资料-天天文库。
1、Unit2GrammarandUsageModalverbsLead-inWecanbe there on time tomorrow.MayI comein?Shallwe begin now?Youmustobey the school rules.Learningobjectives1.Masterbasicusageofmodalverbs(can/could).2.Finishtherelevantexercises.Self-studyguidance(1)RefertotheworkbookonP49andfindoutthedefinitionofmodalverbs
2、andconsiderhowmanymodalverbsyouknow.情态动词的定义:情态动词是一种本身有一定的词义,表示说话人的情绪,态度或语气的动词,但不能单独作谓语,只能和其他动词原形构成谓语。Howmanymodalverbsdoyouknow?cancouldmaymightshallshouldmustwillwouldoughttohavetodare(daren’t)need(needn’t)usedtomodalverbscan/could的用法二．情态动词的语法功能Wecanusemodalverbstotalkabout:abilitycertaintyper
3、missionobligationmakerequestsmakesuggestionsmakeoffersgiveadvice能力义务,责任确定性允许提出请求提出建议提供帮忙提出忠告Modalverbs:generalintroduction用法一：Ability(能力)LiuXiangcanrunthe110mhurdleracewithin13seconds.1.Nowmanyofus_____(能）speakEnglishquitewell,butafewyearsago,we______(不能can指现在的能力could表示过去的能力2.Nowmanyofus_____(能
4、）speakEnglishquitewell,butafewyearsago,we______(不能cancouldn’tareabletoweren’tabletobeableto也可表示能力，它的用法，要比can/could要正式一些,但不常用。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
5、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。Thefirespreadthroughthehotelveryquicklybuteveryone____getout.A.hadtoB.wouldC.couldD.wasabletoDbeabletodosth.=managetodosth.=succeedindoingsth.3.I’msorryI_______________(不能）playtenniswithyourecently.4.It’sniceto_____________(能）attendthelecture.5.WangGong
6、_______________(可能能）winthechessgame.haven’tbeenabletobeabletomightbeabletobeableto用于不同的时态2.可用在不定式之后3.可用在情态动词之后Theywill______runthismachineontheirowninthreemonths.A.canB.couldC.mayD.beabletoDA试试吧！用法二：表示允许（permission)---Can/CouldIhavealookatyournewpen?---Yes,youcan/No,youcan’t.---CouldIborrowyour
7、dictionary?---Yes,ofcourseyou___AmightBwillCcanDcouldCcan/could/may/mightPermission允许informal/spokenformal/writtenCan/May/Could/MightIcomein?Yes,youcan/mayYes,please.No,youmustn’t.Pleasedon’t.No,youmaynot.could常用于疑问句中，比can更加委婉，表示礼
