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1、初中情态动词初中情态动词第1页，本讲稿共33页1.mustYou must come in time.1)表示必须、必要。是说话人的主观看法 在回答引出的问句时，如果是否定的，不能用mustnt（禁止，不准），而用neednt,dont have to（不必）.-Must we hand in our exercise books today?-Yes,you must.-No,you dont have to/you neednt.第2页，本讲稿共33页1.mustYoure Toms good friend,so you must know what he likes best.2)表示推
2、测、可能性（只用于肯定的陈述句）第3页，本讲稿共33页1.(13江西江西)Theres only one day to Go.You _ finish your work by Tomorrow.A.can B.will C.must D.may2.(11江苏江苏)Fifty dollars for a T-Shirt!You _ be joking!A.must B.need C.may D.can 第4页，本讲稿共33页Might and may1)表示请求和允许。might比 may语气更委婉，而不是过去式 否定回答时可用cant 或mustnt，表示“不可以，禁止”。-Might/Ma
3、y I smoke in this room?-No,you mustnt.-May/Might I take this book out of the room?-Yes,you can.(No,you cant/mustnt.)用May I.？征徇对方许可时比较正式和客气，而用Can I.？在口语中更常见。第5页，本讲稿共33页2）用于祈使句，表示祝愿。May you succeed!1.(13河北)_IseeyourIDcard,sir?Wehavetocheckyourinformation.A.MayB.MustC.ShouldD.Need第6页，本讲稿共33页3)表示推测、可能性（
4、不用于疑问句）。might不是过去式，它所表示的可能性比may小。1He may/might be very busy now.2Your mother may/might not know the truth.第7页，本讲稿共33页2.(11安徽安徽)May I go out now,Dad?-No.You _ let your mother knowFirst.A.can B.may C.need D.must3.(13年湖北年湖北)Must I go there withYou?-No,you _.David _ go therewith you.A.mustnt;can B.cant;
5、mustC.dont;should D.neednt;may 第8页，本讲稿共33页三、can,could Can you lift this heavy box?（体力）Mary can speak three languages.（知识）Can you skate?（技能）1)表示能力（体力、知识、技能）。第9页，本讲稿共33页此时可用be able to代替。Can只有一般现在时和一般过去式；而be able to则有更多的时态。Ill not be able to come this afternoon.当表示“经过努力才得以做成功某事”时应用be able to，不能用Can。如：H
6、e was able to go to the party yesterday evening in spite of the heavy rain.第10页，本讲稿共33页2)表示请求和允许。-Can I go now?-Yes,you can./No,you cant.此时可与may互换。在疑问句中还可用could,might代替，不是过去式，只是语气更委婉，不能用于肯定句和答语中。-Could I come to see you tomorrow?-Yes,you can.(No,Im afraid not.)第11页，本讲稿共33页3)表推测可能性。肯定句中：can表示理论上的可能性；
7、may表示事实上的可能性，如：In Yuyao,sometimes it can be really cold.Tom may go camping with us tomorrow,but he is not sure.否定句和疑问句中，只能用can表猜测可能性。Someone is knocking at the door,and who can it be?It cant be Tom because he has gone to Beijing.第12页，本讲稿共33页1.(13北京北京)-_ you sing an English song?-Yes,I canA.Can B.May
8、 C.Must D.Need2.(13福建福建)-Is that girl Susan?-It _ be her.She left for Beijing yesterday.A.neednt B.cant C.mustnt 第13页，本讲稿共33页四、shall 1)shall 用于第一人称，征求对方的意见。What shall we do this evening?shall I clean the room for you?第14页，本讲稿共33页2)shall 用于第二、三人称，表示说话人给对方的命令、警告、允诺或威胁。1.You shall fail if you dont work
9、 hard.(警告)2.He shall have the book when I finish it.(允诺)3.He shall be punished.(威胁)第15页，本讲稿共33页五.should1)表示“应该”，常用来表示劝告、建议；认为“某人应该做某事”或“有义务责任做某事”。We should obey traffic laws.You shouldnt watch TV every day。You shouldnt have made this kind of silly mistakes.Tom should have brought his report today.这时
10、它可以和这时它可以和 ought to，be supposed to 互互换使用换使用 第16页，本讲稿共33页2)Should(ought to)表示推测时，是指有一定根据的推测，意为“可能、该”-When can I come for the photos?I need them tomorrow,-They _ be ready by 12:00第17页，本讲稿共33页3.表示惊讶的语气You can never imagine such a gentleman should be so rude to a lady.第18页，本讲稿共33页1.(11浙江浙江)Schools _ all
11、ow studentsat least one hour a day for sports.A.would B.might C.should 2.(13江苏江苏)-_ I do the laundryFirst,Mum?-No,you_.You can do your homework first.A.Must;mustnt B.Can;mustntC.Must;neednt D.May;neednt 第19页，本讲稿共33页六：will 和would1)表示意志或意愿：决心，愿意，We will do our best to save the child.我们会尽力抢救这个孩子。I told
12、 her to stop crying,but she just wouldnt listen.我叫她别哭,可她就是不愿听。第20页，本讲稿共33页2)表示请求、建议或征求对方意见时，用Would you?比用Will you?更婉转。如：Will/Would you please keep the door open?请让门开着好吗？Will/Would you go with me?你愿意和我一起去吗?第21页，本讲稿共33页相关情态动词would like表示愿意I would like to have a word with you.我想同你说句话。would ratherthan宁愿
13、也不愿I would rather fail than cheat in the examination.我宁愿考不及格，也不愿意考试作弊。第22页，本讲稿共33页七。need1need作情态动词无人称或数的变化，后接动词原形，多用于否定句和疑问句中。如：Youneedntworry.你不必担心I neednt have brought the raincoat with me in such a sunny day yesterday.第23页，本讲稿共33页2由need引出的一般疑问句，肯定回答常用must或haveto;否定答语常用neednt.如：NeedIanswerthequest
14、ion?我需要回答那个问题吗？Yes,youmust.-Yes,youhaveto.是的，你必须回答。-No,youneednt./you dont have to不，不必了。第24页，本讲稿共33页由must引出的一般疑问句，肯定回答用must,否定答语用neednt或donthaveto。如：MustIdotheworknow?我必须现在干这个活吗？Yes,youmust/haveto.-No,youneednt/donthaveto.第25页，本讲稿共33页Need 做行为动词Need sthNeed to do sthNeed doing=need to be done表被动否定：do
15、nt need第26页，本讲稿共33页八：dare 敢通常用于疑问句、否定句或条件句中Dare you ask him?你敢问他吗？She dare not go out alone.她不敢单独出去。I dont know whether he dare try.我不知道他敢不敢试。第27页，本讲稿共33页注意：1.有过去式dared。如：No one dared speak of it.没有人敢提及此事。2.How dare you/he/she/they?表示说话人对某人的行为表示愤慨。如：How dare you ask me such a question?你怎敢问我这样的问题?3.I
16、 dare say表示“我相信，我认为，可能”。如：I dare say you are right.我认为你是对的 第28页，本讲稿共33页作行为动词：可用于各种句子中；在疑问句或否定句中，to经常被省略。如 Did anyone dare(to)admit it?有人敢于承认吗?He did not dare(to)leave his car there.他不敢把车停放在那里。If he dares to show up at her house Ill be surprised.如果他敢出现在她的房子里，我会感到吃惊。第29页，本讲稿共33页注意点一：表推测可能性：must,can,ma
17、y,might,cant,couldnt-I heard they went skiing in the mountains last winter.-it _ true because there was little snow where.第30页，本讲稿共33页二、表推测的用法 1.must have done过去肯定做了某事 Since the road is wet,it must have rained last night.不存在 mustnt have done 的形式。其否定或疑问形式须用 can(could)来表示.例如：He cant have missed the wa
18、y.I drew him a map.“The dictionary has disappeared.Who could have taken it?”第31页，本讲稿共33页may/might have done I cant find my keys.I may/might have left them at the school yesterday.我找不到我的钥匙了。我可能昨天把他们落在学校了。John may/might not have passed the exam;he looks very sad.约翰可能没有通过考试。他看起来很忧伤。第32页，本讲稿共33页3.can/could have done 表推测一般用在否定句和疑问句中，表示不相信或怀疑的态度。Can/Could he have passed the exam?他可能通过了考试吗？I think that he couldnt/cant have gone abroad.I saw him just now.我认为他不可能出国了。我刚才还看见他了。第33页，本讲稿共33页