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1、关于高一下情态动词第1页，此课件共27页哦情态动词用法情态动词用法n情态动词的两两个主要的用法是：n1.表示：n判断、推测判断、推测 _n2.表示：n语气语气 _第2页，此课件共27页哦二情态动词包括：ncan,may,must,could,might,need,dare,shall,should,will,would,ought to,have to 第3页，此课件共27页哦三情态动词的特点：n1.无人称和数量的变化。无人称和数量的变化。n2.不能单独使用做谓语，必须要使用情不能单独使用做谓语，必须要使用情态动词态动词+do的结构。的结构。n3.情态动词的过去式并不只是表示过去情态动词的过去
2、式并不只是表示过去的时态，还可以是一种委婉的语气。的时态，还可以是一种委婉的语气。第4页，此课件共27页哦四can may must 的用法nA.can may must在判断句式中，表示推测nmust:n 有把握，语气肯定，推断有依据，只有肯定形式有把握，语气肯定，推断有依据，只有肯定形式。如：nLook at his face.He_ be very angry.nLook at the clouds.It_ rain sooner or later.must must 第5页，此课件共27页哦can:n表示否定或疑问的判断表示否定或疑问的判断。n如：n1）-Is Jack on duty
3、 today?n-It cant be him.Its his turn tomorrow.n2)Can this be true?第6页，此课件共27页哦may:n表示推测和可能。不用于疑问句表示推测和可能。不用于疑问句 句子中总会有不确定的信息（Im not sure.）如：n1)Im not sure.He may come.n2)He may be very busy now.第7页，此课件共27页哦n以上都是对现在或将来的推断，如果是对过去的推断会是怎样的呢？Lets have a try.n1)The road is wet.It must have rained last nig
4、ht.n2)-Do you know where David is?I couldnt find him anywhere.n -Well.He cant have gone far.His coat is still here.第8页，此课件共27页哦B.can may must表示语气的用法I.can/could 的用法ncan/could:表示能力、请求和许可nMan cant live without air.nCan I go now?nCan you finish this work tonight?nCan/Could you say it again?第9页，此课件共27页哦注
5、意：n1)could也可以表示请求，语气比较委婉，主要用于疑问句，不能用于肯定句，答语应该用can。如:n-Could I come to see you tomorrow?n-Yes,you can.n(否定No,Im afraid not.)第10页，此课件共27页哦n2)can 表示能力时，还可以用be able to代替。如：Ill not be able to come this afternoon.n但当我们表示“某件事已成功”时，应该用“was(were)able to”,而不用“could”nNo one was killed in the fire.All the peopl
6、e were able to escape.nHe was able to go to the party yesterday evening and he enjoyed himself very much.第11页，此课件共27页哦can 还可以表示惊异或怀疑。nHow can you be so careless.nCan this be true?第12页，此课件共27页哦II.may/might 的用法n1.表示许可。might 比may语气更加委婉，否定回答时可以使用cant 或mustnt,表示“不可以”、“禁止”、阻止。n1)-May I take this book out?
7、n-Yes,you can.n(-No,you cant./No,you mustnt.)第13页，此课件共27页哦n2.用于祈使句中表示祝愿。n May you succeed!3.与一些固定词组的搭配 may as well,might as well+doIts getting dark.We may as well walk home.I may as well have a rest first.第14页，此课件共27页哦III.must have to 的用法n1.表示必须、必要。nYou must come in time.n2.must引出的问句，如果是否定的回答要用 need
8、nt 或 dont have to.n-Must we hand in our homework today?n-Yes,you must.n No,you dont have to.No,you neednt.n3.Must you play the piano at midnight?第15页，此课件共27页哦4.must 和have to 的区别na.must表示说话人的主观看法，而have to 则往往强调客观需求。nThis play is not interesting.I really must go now.nI had to work when I was your age.
9、nb.must 只表示现在，have to则有更多的时态变化。nc.must可以表示推断，而have to则不能。nd.询问对方意见时，应该使用must nMust I clean all the rooms?Yes you must.第16页，此课件共27页哦IV.dare 和need 的用法n1.dare 做情态动词时，主要用于疑问句、否定句和条件从句，一般不用于肯定句。nHow dare you say Im unfair.nHe darent speak English before such a crowd,dare he?n2.need表示“需要”或“必须”，做情态动词时仅用于否定
10、或疑问句中，在肯定句一般用must,have to,ought to或should 代替。nYou neednt come so early.第17页，此课件共27页哦IV.dare 和need 的用法n3.dare,need常用作实义动词，有时态、人称和数的变化。所不同的是作实义动词在肯定句中，要用dare to/need to如:nHe needs to finish it this evening.第18页，此课件共27页哦V.shall/should 的用法n1.shall 用于第一人称，表示征求对方意见。nWhat shall we do this evening?n 2.shall
11、用于第一、第三人称疑问句中，表示征求对方意见或向对方请求。nWhen shall he leave the hospital?nShall we begin our class?第19页，此课件共27页哦V.shall/should 的用法n 3.shall用于第二、第三人称，表示说话人给对方的命令、警告、允诺或威胁。nHe shall be punished.(威胁)You shall fail if you dont work harder.(警告)nHe shall have the book when I finish reading.(允诺)nAll the candidates s
12、hall be seated before the papers are handed over.(命令,规定)第20页，此课件共27页哦V.shall/should 的用法n4.should表示劝告、建议、命令。可以和ought to通用。nYou should go to class right now.nShould还可表示对客观情况的看法,按常理按常理,约定情况约定情况,“理应该理应该”nThe pictures should be ready by 12 0clock.nThe car should get repaired by tomorrow.nYou practised a
13、lot for the driving test,so there shouldnt be any problem for you.nHe should come by 2 0clock.第21页，此课件共27页哦V.shall/should 的用法n5.should have done nYou should have finished your homework last night,but actually you didnt.nYou shouldnt have told lies to your mum.第22页，此课件共27页哦V.shall/should 的用法n6.should
14、与how,why连用表示对某事不能理解，感到意外，惊异等“竟会竟会”“居然居然”nHow should you be so rude to your friend?nHe is on time for everything.How should he be so late for the important meeting?n7.表表“万一万一”nIf things should change suddenly,please let me know.nIf it should rain tomorrow,youd better bring your umbrella.第23页，此课件共27页哦
15、VI will/would的用法n1.表示请求、建议would 比will委婉客气。nWould you pass me the book?n2.表示意志、愿望和决心 nI will help you,please dont worry.(表意愿)nThey asked us if we would do that again.I will never do that again.第24页，此课件共27页哦VI will/would的用法n3.would 可以表示过去反复发生的动作或某种倾向，would表示过去的习惯比used to 正式，而且没有“现在无此习惯”的含义。nDuring the vacation he would visit me every week.nThe wound would not heal.第25页，此课件共27页哦n系列练习：系列练习：n(见学案见学案)第26页，此课件共27页哦感谢大家观看第27页，此课件共27页哦