高一英语英语必修3Unit1语法情态动词(课堂PPT)

1,ModalVerbs,Unit1,2020/6/2,2,情态动词表示说话人的某种感情或语气，对某一动作或状态的某种态度。表示“需要、可以、必须、应当”等。,什么是情态动词？(ModalVerbs),can/could,may/might,must/haveto,shall/should(oughtto),will/wouldneed,dare/dared,2020/6/2,3,1.can的主要用法是：A.表能力eg.Thegirlcandanceverywell.beableto通过努力做成某事HewasabletoreachMountQomolangmain2000.B.表示说话者的推测事物的可能性:(否、疑）eg.Canthenewsbetrue?C.在口语中,can可以表示请求或允许：eg.CanIsithere?,can和could,2020/6/2,4,2.could的主要用法是：A.could是can的过去式,表示与过去有关的能力和推测:Weallknewthattheyoungmancouldntbeadoctor.B.could可以代替can表示请求,但语气较can客气、委婉:could提问，答语用can-CouldIborrowyourpen?-yes,youcan.,2020/6/2,5,may常用来表示：1.在正式文体中表示请求、允许（比can正式）：:eg.MayIcomein?Youmaygonow.2.表示说话人的猜测:“也许”“可能”:通常只用于肯定句和否定句中。Theguestmayarrivethisafternoon.-Canheattendthemeeting?-Yes,he_.Iamnotsure.,may和might,may,2020/6/2,6,在肯定句中，may的可能性比can高，may表示现实的可能性，can表示理论上的可能性。如：Theroadmaybeblocked.Mancanlive120.,2020/6/2,7,3.表示祝愿,位于句首eg.Mayyousucceed!Mayyouhaveagoodjourney!4.mayaswell=hadbetterdo(最好做某事）Youdbettertakenotescarefully.Youmayaswelltakenotescarefully.,2020/6/2,8,will和would,will是助动词还是情态动词？will用于构成将来时是助动词。eg.Iwilltellyousomethingimportant.我要告诉你一件重要的事情。情态动词：1.表意愿或意志Iwillneverdoitagain.Ifyouwillmarryme,whateverIhaveisyours,andyoursisyours.,2020/6/2,9,2.提出请求或建议,在疑问句中用于第二人称。eg:Ifyouwanthelp,letmeknow,willyou?Willyoutypethis,please?祈使句问句与答语一般用willOpenthedoor,willyou?-Pleasecometomyparty.-Yes,Iwill3.表习惯或必然结果Fishwilldiewithoutwater.Iwillgotoseemyformerclassmatesonweekends.,2020/6/2,10,would&usedto(过去常常，习惯于）would现在有可能做，也有可能不做usedto现在一定没有做Thereusedtobeabigtree.IwouldgotothelibrarywhenIwasfree.I_tocrywhenIwasachild.,usedto,2020/6/2,11,shall和should,shall用法1.shall表征求意见，用于一三人称疑问句中Shallwegobytrain,Mom?Shallheattendthemeeting?2.用于二三人称的陈述句中，表威胁警告命令允诺等语气YoushallgetapresentwhenIcameback.Youshallbepunishedifyoubreaktherules.,2020/6/2,12,should用法应该=oughttoYoushouldstudyhard.2.表万一，多位于句首。Shouldhecome,Iwouldletyouknow.3.“居然”，“竟然”,表说话人意料之外。针对现在-should+V原针对过去-havedoneTomysurprise,heshouldbeathief.Heshouldhaveliedtomeyesterday.,2020/6/2,13,must的主要用法,1.必须。must表主观“必须”haveto表客观“不得不”ImustgohomethisSaturday.Ivegotacold,soIhavetoseeadoctor.-MustIstayhere?-Yes,youmust./No,youneednt./youdonthaveto.mustnt表禁止，不准，一定不要。Youmustntplaywithfire.Youmustnttakedrugs.,2020/6/2,14,2.表“偏要”“偏偏”，违背说话人意