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1、Discovering Useful Structures P54 2023-2024学年度新人教必修三学年度新人教必修三Unit 5 The Value of MoneyLeading-inMay we ask what youre doing in this country and what your plans are?I cant say that I have any plans.You mustnt worry about that.Could you offer me work here?Read the sentences below and think about:What
2、are the functions and meanings of these modal verbs?Modal verbs have many functions,including the following(A-F).PresentationA.necessity B.possibility C.obligation D.request E.advice F.intentionFind modal verbs in previous sections and discuss their functions.Read the passage and fill in the blanks
3、with suitable modal verbs in the box.may must can ought to might had better would shouldIn the film The Million Pound Bank Note,Henry Adams is stuck in a foreign country without money and friends,and with nowhere to stay.While this situation _ seem unusual,it can sometimes happen to travellers.In ca
4、se it happens to you on a trip abroad,what _ you do?First,and most importantly,you _stay calm.Fear _ cause you to become confused.You need to thinkmayshouldmustcanRead the passage and fill in the blanks with suitable modal verbs in the box.may must can ought to might had better would shouldclearly.S
5、econd,you should go to your nearest consulate.They _ be able to help to some extent.Third,you _ do well to check with some local charities.They _offer help to travellers in need.Fourth,you _avoid getting into trouble.You _ think that stealing some money or food would help you,but you should not do s
6、o.Getting caught _ ruin your life.ought towouldmighthad bettermightwouldI.Review of modal verbsGrammarGrammar一、情态动词的语法特征1.1.情态动词可以表示可能、建议、愿望、必要、情态动词可以表示可能、建议、愿望、必要、允许、能力等。允许、能力等。2.2.情态动词没有人称和数的变化。情态动词没有人称和数的变化。3.3.情态动词必须和实义动词一起构成谓语。情态动词必须和实义动词一起构成谓语。4.4.情态动词除情态动词除ought和和have外，后面只能接不带外，后面只能接不带to的不定式。
7、的不定式。5.5.情态动词没有非谓语形式，即没有不定式、分词情态动词没有非谓语形式，即没有不定式、分词等形式。等形式。1.只作情态动词的：2.可情态可实义的：3.可情态可助动词的:4.相当于情态动词的:二、情态动词的分类can/could,may/might,ought to,mustneed,dare/daredshall/should,will/wouldhave to,used to2.must 表示必须、必要。回答表示必须、必要。回答must引出的问句时引出的问句时,如果是否定的回答如果是否定的回答,不能用不能用mustnt，而要用而要用 neednt 或或 dont have to。
8、三、情态动词的用法must,can Must we hand in our exercise books today?Yes,you must.(No,you dont have to.)1.must 表示推测时，表示推测时，只能用于只能用于肯定句肯定句。There must be something wrong with the computer.You have worked hard all day.You must be tired.3.can t在口语中代替在口语中代替mustn t时，表示禁止或不准。时，表示禁止或不准。You cant play football in the s
9、treet.can/could1.can/could 表推测表推测,只能用在只能用在否定句或疑问句中。否定句或疑问句中。Its so late.Can Tom be reading?She couldnt be telling lies.*对对过去发生的过去发生的行为进行推测时，常用行为进行推测时，常用can/could have done的否定或疑问形式。的否定或疑问形式。The door was locked.She couldnt have been at home.2.can/could 表能力，表能力，can表示现在的能力，表示现在的能力，could表表示过去的能力。示过去的能力。I
10、 can read this chinese article.She could play the piano at the age of five.*can表示能力时，还可以用表示能力时，还可以用be able to代替。代替。be able to后接动词原形，可用于大多数时态。后接动词原形，可用于大多数时态。I will be able to speak French in another few months.They were able to escape from the building.3.can/could 表许可，表许可，could语气更委婉。语气更委婉。Can I come
11、 in?Could I borrow your pen?may/might1.表示推测时表示推测时,只能用于只能用于陈述句陈述句,可以指现在，也可以可以指现在，也可以 指过去，指过去，且可能性不大。且可能性不大。They may come here tomorrow.He might be doing his homework now.2.表示表示请求或允许请求或允许,might可以指过去的时间，也可指可以指过去的时间，也可指 现在的时间。现在的时间。对对may的一般疑问句的的一般疑问句的肯定回答肯定回答可用可用may或或can,但但作作否定回答否定回答时要用时要用mustnt或或cant。M
12、ay(Might)I have a little brandy?No,you mustnt.Youd better not.3.May可以表示祝愿或希望，而可以表示祝愿或希望，而might不行。不行。May they be very happy in the future.May you succeed in the coming year.shall/should1.在在一、三人称一、三人称的疑问句中的疑问句中,shall用来询问对方的意愿。用来询问对方的意愿。Shall we begin our lesson?2.用于用于二、三人称二、三人称的陈述句中的陈述句中,表说话人命令、警告、表说话
13、人命令、警告、允诺等口吻。允诺等口吻。He shall have the book when I finish reading.You should be polite to your teachers.will/would1.表示请求、建议等表示请求、建议等,would比比will委婉客气。委婉客气。Would you pass me the book?2.表示意志、愿望和决心。表示意志、愿望和决心。I will never do that again.They asked if we would do that again.3.should表示劝告、建议、命令，用于各种人称。表示劝告、建议
14、、命令，用于各种人称。4.should表示说话人的惊讶、愤怒、失望等特殊情感，表示说话人的惊讶、愤怒、失望等特殊情感，意为意为“居然，竟然居然，竟然”。Amazing!You should wear slippers at work.ought to1.表示职责和义务，意为表示职责和义务，意为“应该应该”(因责任、义务等该因责任、义务等该 做做)，口气比，口气比should稍重。稍重。You oughtnt to smoke so much.2.表示推测，暗含很大的可能性，近似于表示推测，暗含很大的可能性，近似于should。Han Mei ought to know his telephon
15、e number.dare/need1.作情态动词时，主要用于否定句、疑问句和条件从作情态动词时，主要用于否定句、疑问句和条件从 句中，一般不用在肯定句中。句中，一般不用在肯定句中。He doesnt dare(to)answer.You didnt need to do it yourself.How dare you say Im unfair?You neednt come so early.2.dare和和need作实义动词时，其否定和疑问的构成需作实义动词时，其否定和疑问的构成需 借助借助do/did/does，need后面接带后面接带to的不定式，而在的不定式，而在 疑问句和否定句
16、中，疑问句和否定句中，dare后可省去后可省去to。有时态、人。有时态、人 称和数的变化。称和数的变化。II.The past future tense 过去将来时过去将来时GrammarGrammar一、定义过去将来时，表示从过去某一时间来看，将要发生的动作或存在的状态。二、结构1.would/should+动词原形He asked me how soon I would get ready.I asked him if Peter would arrive the next day.She told me she would make do with it later.2.was/were going to+动词原形She told me she was going to post the parcel.He was going to start off at once.*与would+动词原形相比，was/were going to+动词原 形有打算、计划的含义。3.was/were about to do表示说话的瞬间将要发生的动作。此结构一般不与时间状语连用，但后面可以接wh
