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单击此处编辑母版文本样式,人教版英语必修第,三,册,返回导航,下页,上页,Period Discovering Useful Structures,Period Discovering Useful St,语法 专项突破,语法 专项突破,Unit-5-the-value-of-money-高中英语语法课件,1,(,教材,P52)Oliver believes that with a millionpound bank note a man could live a month in London.(,),2,(,教材,P52)Young man,would you step inside a moment,please,?,(,),3,(,教材,P52)May we ask what youre doing in this country and what your plans are,?,(,),4,(,教材,P52)Well,I cant say that I have any plans.(,),A,E,E,A,1(教材P52)Oliver believes that,5,(,教材,P52)Well,you mustnt worry about that.(,),6,(,教材,P52)You mustnt think we dont care about you.(,),7,(,教材,P52)Well,it may seem lucky to you but not to me,!,(,),8,(,教材,P52)Now if youll excuse me,I ought to be on my way.(,),9,(,教材,P52)Oh,no,youd better not open it.(,),B,B,D,F,C,5(教材P52)Well,you mustnt wor,一、情态动词的基本用法,(,一,)can/could,的用法,1,表,示能力,意为“能,会”。,Many people,can,use the computer.,许多人会用电脑。,No one,could,answer this challenging question.,没人能回答这个具有挑战性的问题。,一、情态动词的基本用法,2,表示客观或理论上的可能性。,It,can,be very hot here in summer.,这里夏天有时会很热。,Accidents,can,happen to any drunken driver.,醉酒的司机都有可能发生交通事故。,3,表示请求或允许。在疑问句中,could,可以代替,can,,语气更委婉。,Could,I have a word with you?It wont take long.,我可以和你谈谈吗?不会花很多时间的。,2表示客观或理论上的可能性。,4,表示推测,意为“可能”,用于否定句和疑问句。,can,比,could,语气强。,He,cant,be our manager.He has gone to Beijing.,他不可能是我们经理。我们经理已经去北京了。,He,cant,have left.His coat is here.,他不可能已经走了。他的外套还在这里。,4表示推测,意为“可能”,用于否定句和疑问句。can比co,(,二,)may/might,的用法,1,表,示请求和许可。在疑问句中,might,可以代替,may,,语气更加委婉。,Might,I ask for a picture of your little daughter?,Yes,you may.,我可以要一张你小女儿的照片吗?,是的,可以。,(二)may/might的用法,2,表示推测,意为“或许,可能”,通常用于肯定句和否定句。,might,比,may,语气弱。,I dont really like James.Why did you invite him?,Dont worry.He,might not,come.He said he wasnt certain what his plans were.,我真的不喜欢詹姆斯。为什么你邀请他?,别担心,他或许不会来。他说他还不能确定他的计划。,3,表示祝愿,常用结构为“,May,主语动词原形!”,May you be,happy every day!,愿你快乐每一天!,2表示推测,意为“或许,可能”,通常用于肯定句和否定句。m,(,三,)must,的用法,1,表示“必须”,语气强烈。,have to,表示“不得不”,意义与,must,相近,但又有所区别。,must,表示说话人的主观看法,,have to,则强调客观需要;,must,只有一种形式,而,have to,有人称、时态等方面的变化。,Shall I inform him of the change of the schedule right now?,I am afraid you,must,in case he comes late for the meeting.,我该马上通知他日程改了吗?,我想你必须,(,通知他,),,以免他开会迟到。,I,have to,go now,because my mother is in hospital.,我现在不得不走了,因为我母亲在住院。,(三)must的用法,2,表示推测,意为“一定”,用于肯定句。,Someone,must,have used my umbrella yesterday.I found it wet.,昨天一定有人用了我的雨伞,我发现它湿了。,3,意为“偏要,非要,不可”。,If you,must,go,at least wait until the storm is over.,如果你非要走,至少要等到暴风雨停止。,4,mustnt,表示禁止,意为“不得,不允许;一定不要”。,That car is my property;you,mustnt,use it without my permission.,那辆车是我的财产,你必须得到我的允许才能使用。,2表示推测,意为“一定”,用于肯定句。,(,四,)shall,的用法,1,用,于第一、三人称疑问句中,表示说话人征求对方的意见。,Shall,we put off the sports meet till next month?,我们能否将运动会推迟到下个月?,Shall,Tom go there with me tomorrow?,明天汤姆可以和我一起去那里吗?,2,用于第二、三人称陈述句中,表示说话人的命令、警告、威胁、允诺、决心等;或用于条约、规定、法令、法律等,意为“必须”。,You,shall,be punished for what you have done.,你必须为你的所作所为受到惩罚。,(四)shall的用法,(,五,)should/ought to,的用法,1,should,表,示责任、义务、劝告、建议等,意为“应该”。,We,should,be strict with ourselves.,我们对自己应该严格要求。,2,should,表示出乎意料的口气,意为“竟然,居然”。,Such a gentleman,should,do that.,这样一位绅士竟然会做那种事。,(五)should/ought to的用法,3,ought to,表示义务或责任,意为“应该”,语气比,should,稍重。,You,ought,not,to,be late for such an important meeting.,这么重要的会议你不应该迟到的。,4,should,和,ought to,表示推测,指预期的可能性,意为“应该,估计”。,She promised to come by 10 oclock.She,should/ought to,be here at any moment.,她答应,10,点之前来的。她随时都可能来到。,3ought to表示义务或责任,意为“应该”,语气比sh,(,六,)will/would,的用法,1,表,示意愿、意志、决心。,will,指现在,,would,指过去。,I will never talk to him again.,我再也不愿意和他说话了。,Why didnt you come to Simons party last night?,I wanted to,but my mom simply,would,not let me out so late at night.,为什么你昨天晚上没来参加西蒙的聚会?,我想去参加,但只是我妈妈不愿意让我那么晚出去。,(六)will/would的用法,2,表示征求意见或提出请求,多用于第二人称疑问句中。,would,比,will,语气委婉。,Would,you mind opening the window for me?,请你给我打开窗户好吗?,3,表示习惯性动作、固有属性、必然趋势,意为“总是,习惯于”。,will,指现在,,would,指过去。,Every morning he,will,always have a walk along this river.,每天早晨,他总会沿着小河散步。,Mum,would,tell us stories before we went to bed.,过去在我们上床睡觉前,妈妈总给我们讲故事。,2表示征求意见或提出请求,多用于第二人称疑问句中。woul,4,表示功能,意为“能,可以”,常用于否定句。,The door,wont,open.,这门打不开。,4表示功能,意为“能,可以”,常用于否定句。,(,七,)need,的用法,作,情态动词时,,need,没有人称和时态的变化,后接动词原形,一般用于否定句或疑问句中。其否定形式是在其后直接加,not,,疑问形式是直接将,need,提到主语前。由,need,构成的一般疑问句,其肯定回答用,must,。,You,neednt,be told twice about one single thing.,同一件事不必对你说两遍。,Need,I tell him everything thats happened to his parents?,Yes,you,must,./No,you,neednt,.,我有必要告诉他有关他父母发生的一切吗?,是的,必须。,/,不,没必要。,(七)need的用法,名师点津,need,还可以作实义动词,此时有人称和数的变化,后面可跟名词、带,to,的不定式或动名词等作宾语,其否定形式、疑问形式都要通过助动词,do,构成。,Plants,need,light in order to survive.,植,物存活必须有光照。,Do I,need to,leave my telephone number and address?,我有必要把电话号码和地址留下吗?,You,dont need to,hand in your compositions today.,你们今天不必交作文。,名师点津need还可以作实义动词,此时有人称和数的变化,(,八,)dare,的用法,1,dare,可,用实义动词和情态动词,用作情态动词时,意思是“敢”,其后接动词原形,通常只用于否定句或疑问句以及,if,或,whether,之后,一般不用于肯定句:,Dare,you tell her the truth?,你敢告诉她事实真相吗?,I dont know whether he,dare,try.,我不知他是否敢试一试。,I,darent,ask her for a rise.,我不敢要求她加薪。,(八)dare的用法,名师点津,I dare say,是习惯说法,(,用于肯定句,),,并不一定要译为,“,我敢说,”,,它所表示的是一种不肯定的语气,常译为,“,很可能,”“,大概,”“,我想,”,等
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