初中情态动词的用法课件

动词分类之动词分类之 情态动词情态动词动词分类之 情态Modalscan/could/be able toshall/should/shouldntmust/have toneedmay12345+do6will/would Modalscan/could/be able to语法互动（八）语法互动（八）系动词和情态动词系动词和情态动词一、情态动词主要有一、情态动词主要有：(1)能：能：(2)可以：可以：(3)必须：必须：(4)需要：需要：(5)将要：将要：(6)将要：将要：can(could),may(might),must/have to,need,will(would)。shall,should语法互动（八）系动词和情态动词can(could),ma二、情态动词的用法：二、情态动词的用法：(1)情态动词情态动词+动词原形，做谓语。动词原形，做谓语。(2)情态动词情态动词没有人称和数没有人称和数的变化。的变化。(3)其其否定否定形式：在情态动词后形式：在情态动词后加加not(have to除外除外)，(4)其其疑问疑问形式：形式：是将情态动词是将情态动词提提至主语至主语前前。二、情态动词的用法：语法互动（八）语法互动（八）系动词和情态动词系动词和情态动词1.2.I swim when I was five years old.3.I use your bike？4.That _ be Mr Wang.He has gone to Beijing.cantcan表示表示请求：请求：can 表示表示能力：能力：cant 可表示可表示否定推测：否定推测：I swim.could 表示表示过去的能力：过去的能力：cancouldCan语法互动（八）系动词和情态动词1.cantcan表示1can/could/be able to的用法：的用法：(1)can(could)表示表示:(2)could 为为 can 的过去式。的过去式。表示请求时，表示请求时，could比比can更婉转。更婉转。(3)can 和和could 只只能能用用于于现现在在时时和和过过去去时时，将来将来时中用时中用 be able to。I will drive a car.“能力能力”“请求对方允许做某事请求对方允许做某事”“可能性可能性”be able to“能能”不不“能能”够1can/could/be able to的用法：1.We _(能能)use the computer now,but we _(不能不能)two month ago.can表示：表示：。2.You _(能能)go now.She _(不能不能)stay here.can表示：表示：3._(能能)you help me with my Enlish?_(能能)I have some water?can 表示：表示：练习练习can的用法的用法can cant cant can Can Can“能力能力”“许可许可”有礼貌地提出有礼貌地提出“请求请求”(用于疑问句用于疑问句)1.We _(能)use the computer1.We shall _(能能)finish the work next week.2.I havent _(能能)find any jobs.be able to 可取代可取代 can，但：但：be able to 可以表达更多的时态可以表达更多的时态。3.No one is able to do it.=No one _ do it.)练习练习be able to 的用法的用法be able tobeen able tocan1.We shall _(能)finis 你你可以可以多穿衣服。多穿衣服。我我可以可以用你的钢笔吗用你的钢笔吗?他他可能可能还活着。还活着。祝祝你开心。你开心。1.may/might的用法：的用法：.You put on more clothes._ I use your pen?.He be alive.you be happy.maymightMay表示说话人表示说话人同意、允许：同意、允许：请求请求对方对方允许；允许；可能性可能性更更小：小：表示表示祝愿祝愿.May请求？祝愿求？祝愿 你可以多穿衣服。maymightMay表示说语法互动（八）语法互动（八）系动词和情态动词系动词和情态动词2.may的否定式为的否定式为 may not。might 是是may 的过去式。的过去式。注意注意:might,could并不是并不是may,can的过去式，的过去式，而是表示而是表示语气较委婉语气较委婉或或可能性较小可能性较小。语法互动（八）系动词和情态动词注意:1.You _(可以可以)go home now.“允许允许”He said that I _(可以可以)drink some beer.2._(可以可以)I watch TV this evening?-_(可以可以)I use you pen?-Yes,you _.-No,you _.No,you _.请求请求“许可许可”(用于疑问句用于疑问句)注意否定回答注意否定回答 练习练习may的用法的用法maymightMayMaymaycantmustntmay 表示：表示：may表示：表示：1.You _(可以)go home now.3.If you are not careful in the street,a car _ hit you.A.can B.may C.would D.must谈论谈论“可能性可能性”4.He isnt in the school.I think he _ be ill.(2006广东广东)A.can B.shall C.mightmay=might=could 表示表示“可能可能”为一般时态，只用肯定形式。为一般时态，只用肯定形式。5.They_ (可能可能)leave the hospital.BCmay/might/could 3.If you are not careful in th我今天我今天必须必须完成我的工作。完成我的工作。那个人那个人一定是一定是我们的老师。我们的老师。你你绝不能绝不能酒后驾车。酒后驾车。1.I _ finish my work today.2.The man _ our teacher.3.You _ drive after drinking.mustmust bemustnt(1)表示表示必须必须做某事。做某事。(2)表示表示肯定推测，肯定推测，意为意为“一定一定”(3)表示表示“禁止禁止”我今天必须完成我的工作。mustmust bemustnt3must的用法的用法must 意为意为“必须必须”,表示表示必须做某事。必须做某事。must 意为意为“一定一定”,表示对事物的表示对事物的肯定推肯定推测测 mustnt 表示表示“禁止，禁止，严禁严禁,禁止禁止,不许不许”3must的用法(1)must 和和 have to 的区别的区别：must 表示表示 ；have to 表示表示 。如：。如：我我必须必须首先做家庭作业。首先做家庭作业。外面雨下得很大，我外面雨下得很大，我不得不不得不待在家里。待在家里。1.I do my homework first.2.It is raining hard outside;I _ stay at home.have tomust主观认为主观认为客观逼迫客观逼迫必须？不得不must/have to(1)must 和 have to 的区别：have to语法互动（八）语法互动（八）系动词和情态动词系动词和情态动词(2)回答回答must 的提问：的提问：Must I go home now?Yes,you must.No,you _.No,you 肯定回答：肯定回答：否定回答：否定回答：neednt.dont have to.或或Yes，you must.No,you neednt.No,you dont have to.语法互动（八）系动词和情态动词(2)回答must 的提问 1.Everybody_(必须必须)obey the rules.I _(必须必须)go now.This work _(必须必须)be finished as soon as possible.2.You _不准不准 lend the book to others.“必要性必要性”3.Children _ play on the road or in the street.It is dangerous.A.may not B.mustnt C.couldnt D.neednt“禁止禁止，不准，不准”；代替代替 may not 表示表示“不许可不许可”。练习练习must的用法的用法mustmustmustmustntBmust表示表示:must表示表示:1.Everybody_(必须)obey 4.Even the top students in our class cant work out this problem,so it _be very difficult.(上海上海)A.may B.must C.can D.need must表示表示“肯定的推断肯定的推断”可能性较大，译为可能性较大，译为“一定一定”B5.Must I return the book tomorrow?Yes,_ .No,_.No,you _dont have to.you mustyou needntneednt=dont have to不必不必4.Even the top students in our6.It was dark.We _(必须必须)go home.Her mother is ill.so she _(必须必须)stay at home and look after her.The students of today will _(必须必须)learn how to use the computers.表示表示“客观需要客观需要”时，用时，用 _ 而不用而不用_。另外另外_ 在句中可以有更多的时态。在句中可以有更多的时态。_只有一般和过去时只有一般和过去时 have tohas tohave tohave tomusthave tomust6.It was dark.The students o“我们我们必须必须现在大扫除吗？现在大扫除吗？”“是的，你们是的，你们必须必须。”“不，你们不，你们不必。不必。”(1)(1)we do some cleaning now?Yes,you must.No,you neednt.Need“我们必须现在大扫除吗？”Yes,you must.No,语法互动（八）语法互动（八）系动词和情态动词系动词和情态动词(2)need 还可当做还可当做实义动词实义动词使用，使用，某某人人需要需要做某事做某事:_ 某某事事需要需要被做被做：_ 如：如：我我需要需要浇花。浇花。花需要浇水。花需要浇水。I need _ flowers.The flowers need_ .to water sb.need to do sth.sth.need doing sth.watering语法互动（八）系动词和情态动词(2)need 还可当做实双双重身重身份份need(需要需要)实义动词实义动词 VS 情态动词情态动词4need的用法的用法:(1)need 表示表示“需要需要”用于用于否定句否定句和和疑问疑问句句 neednt，表示，表示“不必不必”；need 提问时，提问时，肯定肯定回答用回答用 ，否定否定回答用回答用 。must neednt双重身份need(需要)实义动词 VS 情态动词4ne1You _do it again A.dont need B.neednt 2._(需要需要)he do this homework first？3.He _(需要需要)to buy a new bike.作情态动词作情态动词need通常用于否定句和疑问句。通常用于否定句和疑问句。need作实义动词时，后接名词或动词不定式作实义动词时，后接名词或动词不定式 4.Kate said she _需要需要 some help.-Yes，he_.-No,he _.练习练习need的用法的用法BNeed needsneeded must neednt dont have to1You _do it again 5shall和和should的用法的用法:我们我们出去散步出去散步好吗好吗？你们在学校你们在学校应该应该努力学习。努力学习。1._ we go out for a walk?2.You _ study hard at school.shall 用于第一人称，表示用于第一人称，表示提建议提建议或或请求请求；should Shallshould“应该”用来表示劝告、建议；认为“某人应该做某事”。规则伴我行伴我行5shall和should的用法:Shallshouldshould练习练习should的用法的用法1.They should _(应该应该)arrive at noon.2.The classroom _(应该应该)be cleaned up.shouldshould练习should的用法1.They should语法互动（八）语法互动（八）系动词和情态动词系动词和情态动词 6will和和would的用法的用法 你要不要喝点汤？你要不要喝点汤？Will you have a little soup?.will用于第二人称疑问句时，用于第二人称疑问句时，表示表示征求意见征求意见或或提建议：提建议：.would 为为 will 的过去式的过去式,可用于多种人称可用于多种人称,表示表示 意愿。意愿。Will you do sth.?语法互动（八）系动词和情态动词 6will和wou三、三、情态动词表情态动词表推测推测的用法：的用法：1.肯定推测肯定推测：可能性大可能性大“一定一定”：可能性不太大可能性不太大“可能可能”：这本书这本书一定一定是她的，她的名字在上面。是她的，她的名字在上面。他他一定一定是在跑步。是在跑步。他们他们可能可能知道去图书馆的路知道去图书馆的路 。The book be hers.Her name is on it.He be running.They know the way to the library.mustmust must maymay三、情态动词表推测的用法：mustmust must ma语法互动（八）语法互动（八）系动词和情态动词系动词和情态动词2.否定推测：否定推测：“不可能不可能”:_ 那个人那个人不可能是不可能是李老师李老师,因为他去伦敦了因为他去伦敦了.“这件红毛衣会是吉姆的吗？这件红毛衣会是吉姆的吗？”“不，不，不可能不可能。他不能忍受红色。他不能忍受红色。”1.That man Mr Li because he has gone to London.2.Can the red sweater be Toms?No,it .He cant stand red.cant becant cant语法互动（八）系动词和情态动词2.否定推测：cant 考点过关考点过关根据句意及汉语提示完成句子，每空词数不限根据句意及汉语提示完成句子，每空词数不限1.She_(感到开心感到开心)yesterday.2.Must I finish the work now?No,you _ (不必不必)3.I think you _(一定饿了一定饿了).Ill cook dinner for you.felt happy neednt/dont have tomust be hungry考点过关根据句意及汉语提示完成句子，每空词数不限felt h语法互动（八）语法互动（八）系动词和情态动词系动词和情态动词考点过关考点过关4.Peter,is the dictionary Marys?No,it _(不可能是她的不可能是她的).Her dictionary is at home.5.Could I have a look at your photos?Yes,you _ (能能)6.I _(能游泳能游泳)at the age of five.cant be hers cancould swim语法互动（八）系动词和情态动词考点过关4.Pete巩固练习巩固练习1.John_ come to see us tonight,but he isnt very sure yet.A.may B.can C.has to D.must2.They _ do well in the exam.A.can be able to B.be able to C.can able to D.are able to3.-May I take this book out?-No,you_.A.cant B.may not C.neednt D.arentA D A 巩固练习1.John_ come to see us t 4.You_ go and see a doctor at once because youre got a fever.A.can B.must C.dare D.would 5.Can you speak Japanese?No,I_.A.mustnt B.cant C.neednt D.may not B B 4.You_ go and see a doctor 6-He_ be in the classroom,I think.-No,he _ be in the classroom.I saw him go home a minute ago.A.can;may not B.must;may not C.may;cant D.may;mustntC 6-He_ be in the classroom,I7-Shall I get one more cake for you,Dad?-Thanks,but you_,Ive had enough.A.may not B.must not C.cant D.neednt8.The poor man needs our help,_ he?A.need B.neednt C.does D.doesnt D D 7-Shall I get one more cake fo9.You_ worry about your son.He will get well soon.A.neednt B.cant C.mustnt D.have to 10.-Must I take a bus?-No,you _.You can walk there.A.must not B.may notC.dont have to D.had better not to A C 9.You_ worry about your son.11.You _ to go and see the doctor right now.(湖南湖南)A.must B.should C.have D.Will12._ I ask your name,please?A.Will B.Shall C.May D.MustC C 11.You _ to go and see the 13.“Can you sing the song in English?”“No,I _.”A.may not B.mustnt C.neednt D.cant14.You _ do it even if you dont want to.A.cant B.mustnt C.have to D.neednt D C13.“Can you sing the song in E15.Its a fine day today.You _ take a raincoat with you.A.mustnt B.dont need C.neednt D.cant16.The traffic _ stop when the lights are red in the street.A.cant B.dont have to C.mustnt D.MustC D 15.Its a fine day today.C D 17.Must I return the book this morning?-No,you _.But you return it before supper.A.neednt;must B.mustnt;can C.mustnt;may D.cant;need A17.Must I return the book thiSee you!26789 1(北京北京)-Mum,must I wash the dishes now?-No,you _.A.shouldnt B.cant C.mustnt D.neednt 26789 1(北京)26789 1(广东广东)-_I swim here?-Im sorry,children _swim alone here.A.Must;cant B.May;must C.Can;mustnt D.Cant;can 26789 1(广东)26789 1(江西江西)Last year I _ drive.I used to take a bus Last year.A.shouldnt B.should C.could D.couldnt 26789 1(江西)26789 1(2012北京北京)-_ I turn down the radio,please?-Yes,you can.A.May B.NeedC.Must D.Can 26789 1(2012北京)26789 1(2012天津天津)-Can I wear any clothes I like to school?-No,you cant.You _ wear a uniform.A.may B.mustC.will D.would 26789 1(2012天津)26789 1(2011湖北湖北)_ you a happy time.A.may B.cantC.mustnt D.must 26789 1(2011湖北)26789 1(2012河北河北)-Wheres Lucy?-Im not sure,she _ in the school library.A.maybe B.may beC.will be D.must be 26789 1(2012河北)26789 1(2012河北河北)People _ breathe when they are under water.A.shouldnt B.cant C.mustnt D.neednt 26789 1(2012河北)26789 1(2011天津天津)-Lets go to Taishan Park by taxi.-Its not far.We _take a taxi.shouldnt B.cantC.mustnt D.neednt 26789 1(2011天津)26789 1(2010陕西陕西)-Could you help me with my English now?-Yes,I_.A.could B.canC.must D.couldnt 26789 1(2010陕西)