语法专项复习情态动词ModalVerbs课件市公开课一等奖百校联赛优质课金奖名师赛课获奖课件.ppt

单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,本资料仅供参考，不能作为科学依据。谢谢。本资料仅供参考，不能作为科学依据。本资料仅供参考，不能作为科学依据。谢谢。本资料仅供参考，不能作为科学依据。,语法专题复习：,情态动词,(Modal Verbs),1/28,惯用情态动词,can（could）,may（might）,shall（should）,will （would）,must（must）,dare（dared）,need（need）,have to,ought to,be able to,used to,had better,2/28,(1),表示能力:,can/could,只能表示,现在,或,过去,能力。,*,be able to,能用于,各种时态,。,*,was/were able to,:“设法做成某事”,相当于 managed to do sth.,succeeded in doing sth.。,1.,can(could),3/28,(2),表允许，征求意见,Can/Could I use your phone?,*could语气上比can更委婉,客气。,can(could),4/28,(3),表猜测，普通用于否定句和疑问句中：,He cant be in the library now.,Can it be Mr.Green?,can(could),5/28,(4),表,某人或某物,一时特点,，表示“有可能，,有时会”。,Children,can,be naughty.,It,can,be very warm in this area.,can(could),6/28,You cant praise him too much.,You cannot be over careful.,cannot cant 与tooover等词连用，意思是,“越越”,“不论怎样也不为过”,7/28,(1.)表示允许或请求允许。,You,may,keep this one,but you mustnt keep that one.,May,I speak to Janet?,*,might 表示现在时态请求允许或允许，但语气比may更委婉,客气。,You,might,study in our room.,Might,I give you a piece of advice?,may,May,2.,may(might),8/28,(2.)表示猜测(只能用在必定,否定句中),如：,She,may be,on her way home at this moment.,She,may not like,this place.,*might能够,表示过去时态“可能”。如：,She told me she,might come,tonight.,I am afraid she,might think,it was just a joke.,*表示现在时态“可能”，might语气比may 弱。,如：,He,might know,her address.,Be careful,you,might fall down,.,may(might),9/28,(3.)表示祝福,如：,May you succeed!,May you live long!,may,10/28,may/might well动词原形或,may/might as well动词原形,“,还不如，不妨，还是好,”,We may/might as well have something to eat.,11/28,3.,must,(1.)表示“必须”，,如：,We,must think,and well find a way out.,否定式mustnt,表示“禁止”，“不许”。,如：,You,mustnt stay,here.Its dangerous.,*回答用must提问句子，要用neednt作为否定回答，意为“无须”。,Must,I stay in bed all day?,No,you,neednt,/dont have to.,Yes,you,must,.,12/28,3.,must,(2.)表示猜测，只能用在必定句中，,如：,He must be at home now.,13/28,must,*must,有一个含义：“偏要”“硬要”。,表示,说话人对句子主语,所发出动作或行为是,不希望、不满甚至是生气。,Why,must,you be so stubborn?,Why,must,you be so late？,14/28,have to,也能够表示“必须”，但：,have to强调,客观,需要，“不得不”;,must更强调说话人,主观,看法,“必须”.,(2)have to 有较多时态。如：,You,will have to go,back to school to receive continuing education.,You,dont have to,do it.,比较：You,mustnt do,it.,15/28,(1.),用于一，三人称,表示说话人征求对方意见,Shall Li Ping clean the classroom?,Shall we have a break?,4.,shall,(2.)用于二，三人称,表示说话人给对方命令，警告，允诺，威胁，决心等语气,*You shall get a prize from me.,*Each citizen shall carry his identification card when,travelling.,*You shall arrive there before sunset.,*If you dont behave yourself,you shall be punished.,*Nothing shall prevent from us working hard.,16/28,5.,should,(1)You,should,stay here.,(2)They,should,be there by now,I think.,(3)You are mistaken,I,should,say.,(4)Ask Tom to ring me up if you,should,see him.,(5)Why,should,you be so late?,表劝说和提议，应该,表推测，按道理应该，预计,表说话人谦虚，客气，委婉语气，用于第一人称,用于条件句中，表“万一”,表语气，译为“竟然”,17/28,ought to(oughtnt to),(1),表示“应该”,You,ought to,take care of him.,(2),表示推测,He,ought to,be home by now.,18/28,(1)If you,will,listen to me,Ill give you some advice.,(2),Will/would,you please pass me the book?,(3)Fish,will,die without water.,If the pure water is heated to 100,it,will,boil.,(4)The machine,wont,work.,6.,will/would,表意志和意愿,表请求，提议,表习惯性动作,“总是，惯于”,表功效，意为“能，行”,19/28,7.used to(usednt to/didnt use to),表示“过去经常”,*,used to,即能够强调过去习惯性动作(,由动态动词表示,)，也能够强调过去事实或状态(,由静态东此表示,)，且与现在形成对比;,*,would,只强调过去特定情况下习惯性动作(由动态动词表示)，单纯过去和现在无关.,I,used to,like opera，but now Im not interested in it.,She,would,sit there for hours sometimes,doing,nothing at all.,20/28,8.need,作为情态动词时主要用在否定句和疑问句中:,He neednt do it now.,Need we begin right now?,He needs to do it now.,Do we need to begin right now?,You dont need to hand it in.,21/28,9.dare(darent),表示“敢;勇于”,主要用于疑问句,否定句和条件从句中,普通不用于必定句,Dare you go alone there?,The boy darent say so before the teacher.,How dare he do such a thing?,22/28,情态动词短语使用:,would like to do,would rather do,would prefer to do.,had better do.,宁愿,最好做,想做,23/28,了解情态动词完成式使用方法,(情态动词+have done)表示对过去情况,猜测,或,虚拟,24/28,表示对,过去发生事情,推测用：,must/may/might/cant/couldnt+,have done,She passed the exam.She,must have worked,very hard before the exam.,They,cant have finished,the work so,soon yesterday.,She,may/might have left,before I came here.,25/28,用于,虚拟语气,情态动词:,should/ought to have done,shouldnt/oughtnt to have done,might/could have done,neednt have done,本应该做（但事实没做）,原来不应该做（但事实却做了）,原来能够做（但事实没这么做）,原来不需要做（但事实却做了）,26/28,表示否定情态动词使用方法:,部分情态动词否定式是情态动词中考点之一,mustnt,neednt,cant,may not,shouldnt,不准,禁止,没必要(=dont have to),不能;不可能,不能够;可能不,不应该(=ought not to),27/28,注意情态动词推测使用方法,推测性情态动词共有三个，其使用方法见表,情态动词,含义,适用句型,may/might,可能，或许,必定句,否定句,must,一定,必定句,can/could,可能，或许,否定句，疑问句,28/28,