1、新新人教必修人教必修Book 3 Unit 5 The Value of MoneyDiscovering Useful Structures P54 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，即不随主语的不同而变化。，即不随主语的不同而变化。情态动词不能独立使用，须后接动词原形，一起构成谓语动词。情态动词不能独立使用，须后接动词原形，一起构成谓语动词。情态动词的特点情态动词的特点A.necessityB.possibilityC.obligation D.request E.advice F.intention三、情态动词的功能三、情态动词的功能需要需要可能或推测可能或推测职责职
2、责/义务义务请求请求建议建议意图和愿望意图和愿望ExampleNecessity Possibilities Obligation RequestAdviceIntentionWe can discuss it now.You must do it at once.Would you please pass me the salt?You neednt have stayed.You ought to help him.I would rather do it myself.You have to read between the lines because the real messages
3、 are often hiddenIt may seem lucky to you.Astronauts must wear spacesuits when they work in space because May we ask what youre doing in this country?You should/ought to/had better go to class right away.What would you do if you were in her situation?necessity 表必表必要性要性possibility 表表可可能和推测能和推测obligat
4、ion 表义务性表义务性request 表请求表请求advice 表建议表建议intention 表意图和愿望表意图和愿望A.necessity B.possibility C.obligation D.request E.advice F.intentionModal verbspossibilitynecessityobligationrequestadviceintentioncan(could更委婉)may(might更委婉)needhave to(主观）/must（客观）must/ought towouldmayshould/ought tohad betterwouldmustca
5、n情态动词+have done:对过去的猜测 could have done 本可以本可以不可能不可能1.You _(have)a better grade if you made full preparation for the exam.2.I saw him just now,so he _(go)abroad.could have had couldnt been gone couldnt have done should have done 本该做某事（而实际上未做）本该做某事（而实际上未做）shouldnt have done 本不该做某事（而实际上做了）本不该做某事（而实际上做了
6、）你本该寻求帮助的。You should have asked for some help.你本不该告诉她这个消息的。You shouldnt have told her the news.must have done 一定做了一定做了cant have done 肯定没做肯定没做I didnt hear the phone.I _(我刚才没有听到电话，我想必是睡着了。我刚才没有听到电话，我想必是睡着了。)must have been asleep She _,for her bike is still here.(她肯定没离开学校，因为她的自行车还在这里。她肯定没离开学校，因为她的自行车还在
7、这里。)cant have left school must:推测现在或正发生的事情推测现在或正发生的事情：must be doing他现在肯定呆在那里。他现在肯定呆在那里。He must be staying there.must用于一般疑问句中用于一般疑问句中,肯定肯定:must 否定否定:neednt/dont have to（不必）（不必），mustnt表示表示“禁止，不允许禁止，不允许”Must I finish all assignments at a time?Yes,you_.No,you _.mustneednt/dont have todare/need1.作情态动词时，主
8、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。你怎么敢说我不公平？你怎么敢说我不公平？How dare you say Im unfair?你不必这么早过来？你不必这么早过来？You neednt come so early.他不敢回答问题。他不敢回答问题。He doesnt dare(to)answer.你不需要自己动手。你不需要自己动手。You didnt need to do it yourself.2.dare和和need作作实义动词实义动词时，时，其否定和疑问的构成需其否定和疑问的构成需 借助借助do/d
9、id/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。Read the passage and fill in the blanks 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 coun
10、try without money and friends,and with nowhere to stay.While this situation _ seem unusual,it can sometimes happen to travellers.In case 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 thinkmayshouldmustcanRea
11、d the passage and fill in the blanks with suitable modal verbs in the box.may must can ought to might had better would shouldclearly.Second,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 travell
12、ers in need.Fourth,you _avoid getting into trouble.You _ think that stealing some money or food would help you,but you should not do so.Getting caught _ ruin your life.ought towouldmighthad bettermightwouldII.The past future tense 过去将来时过去将来时一、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+动词原形A.Past
13、predictions B.Past promises C.Past decisions D.Past habitsABCD2.was/were going to+动词原形She told me she was going to post the parcel.*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。We were about to go there when it begin to rain.Complete the following sentences tha
14、t describe the future using either form of the given verbs.1.Philip bought two tickets for The Phantom of the Opera.He _ _(watch)with his girlfriend on the weekend.2.I was so surprised at the news that David _ (play)the role of the dinosaur in the play that I gave him a hug out of joy.3.Lily decided
15、 that she _(settle)in New York and pursue her dream of becoming an actress.4.Hey,Timmy.I _(call)you.But now that you are here,I dont have to.5.The competition was so close that no one was sure who _ (win)the Best Actor award6.Jim is not here right now.He said he _(be)on duty at the library this afternoon.would watch/was going to watchwould play/was going to play would settle/was going to settlewas going to callwould winwould be/was going to be
