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1、学习资料收集于网络，仅供参考学习资料助动词与情态动词一、助动词助动词有 be,have,do,will,shall。它们本身没有词义，只和实义动词的一定形式构成复合谓语，用来表示时态和语态，构成否定、疑问及加强语气等。1、be(am,is,are,were,been)（l）“be+-ing”构成进行时态；（2）“be+过去分词”构成被动语态；（3）“be+动词不定式”构成复合谓语：表按计划安排要发生的事。The prime minister is to visit Japan next year.总理将于明年访问日本。用于命令。Youre to do your homework before
2、you watch TV.你得做完了作业才能看电视。2、have(has,had)(1)“have+过去分词”构成完成时态。如：Have you seen the film?(2)“have been+-ing”构成完成进行时态。如：What have you been doing these days?这些日子你一直在干什么?3、do(does,did)(1)“do not+动词原形”构成行为动词的否定式。如：His brother doesn t like playing basket.；(2)“Do+主语+动词原形”构成行为动词的一般疑问句。Does he go to school by
3、 bike every day?(3)“do+动词原形”用于祈使句或陈述句中表示加强语气。如：I did go to see him,but he wasn t in 我确实去看望他了，但他不在家。Do do some work.请一定做点什么；(4)代替前面刚出现的动词以避免重复。My mother told me to go to bed early.So I did.4、will,shall(would,should)“will(shall+动词原形)”构成一般将来时，一般来说，shall 用于第一人称，will 用于第二人称或第三人称，口语中常用will 代替 shll，如：We wi
4、ll have a meeting to discuss the problem.二、情态动词情态动词表示说话人对某一动作或状态的态度，可以表示“可能”、“可以”、“需要”、“必须”或“应当”等之意。情态动词没有人称和数的变化。但不能单独作谓语动词用，必须在其后面接动词原形构成谓语动词。只有情态动词ought 要和带 to 的动词不定式连用，在句中作谓语用。将情态动词置于主语之前即构成其疑问式，在情态动词之后加not 既构成其否定式。现将各情态动词的基本用法分述如下：1、can和 could(could为 can 的过去式)的基本用法(1)表示能力，如：He can speak English
5、 better than you.(2)在疑问句和否定句中表示“怀疑”、“猜测”或“可能性”，如：Can this green bike be Liu Dongs?名师资料总结-精品资料欢迎下载-名师精心整理-第 1 页，共 6 页 -学习资料收集于网络，仅供参考学习资料(3)表示“许可”时can 可以和 may 换用，如：You can(may)go home now.(4)如果要表示语气婉转，可用 could 代替 can，这时 could 不再是 can的过去式，如：Could you come again tomorrow?(5)can 和 be able to 都可表示能力，两者在意
6、思上没有什么区别。但是 can 只能有现在式和过去式，而 be able to 则有更多的形式，如：He will be able to do the work better.2、may和 might(might为 may的过去式)的基本用法（1）表示允许或征询对方许可，有“可以”之意，如：You may use my dictionary.在回答对方说“可以做某事”或“不可以做某事”时，一般多不用 may 或 may not，以避免语气生硬或不容气。而用比较婉转的说法进行回答。如：-May I use this dictionary?-Yes,please.或-Certainly.在请求对方
7、许可时，如果 Might I?就比用 May I?语气更婉转些，如：May I have a look at your new computer?但是表示“阻止”或“禁止”对方做某事时，要用 must not 代替 may not，如：-May we swim in this lake?-No,you mustnt.It s too dangerous.（2）may 或 might 都可以表示可能性，表示“或许”、“可能”之意，如果用might 表示可能性，则语气更加不肯定，如：They may(might)be in the library now.3、must的基本用法（1）must 表示
8、“必须”、“应该”之意，其否定式must not，缩写形式为mustnt，表示“不应该”，“不准”、“不许可”或“禁止”之意，如：We must study hard and make progress every day.You mustnt touch the fire.（2）对以 must 提出的疑问句，如作否定回答时，要用neednt 或用 dont(doesnt)have to(不 必)来回答，而不用 mustnt，因为 mustnt 表示的是“禁止”或“不许可”之意，如：-Must we finish the work tomorrow?-No,you neednt(dont ha
9、ve to),but you must finish it in three days.（3）在肯定句中must 可以表示推测，表示“一定”或“必定”之意，如：-Whose new bike can it be?-It must be Liu Dongs.I know his father has just bought him a new one.4、can,could,may,must 后接完成式的用法（1）can,could 后接完成式的用法：在否定句或疑问句中表示对过去发生过的事情的“怀疑”或“不肯定”的态度，Could he have said so?在肯定句中，可以表示过去可能做到
10、而实际并没做到的事情，有“劝告”或“责备”的语气。如：-When did you answer her letter?-Only yesterday.-Its too late.You could have answered it earlier,I am sure.（2）may,might 后接完成式的用法表示对过去某事的推测，认为某一件事情在过去可能发生了。如果使用might，语气就比较婉转或更加不肯定，如：Mary might have learned some Chinese before.名师资料总结-精品资料欢迎下载-名师精心整理-第 2 页，共 6 页 -学习资料收集于网络，仅供
11、参考学习资料可以表示过去本来可以做到而实际没有做到的事情，有“劝告”或“责备”的语气，如：You didnt do the work well that day.You might have done it better.（3）must 后接完成式的用法：表示对过去某事的推测，认为某事在过去一定做到了，如：Liu Dong isnt in the classroom.He must have gone to the library.5、have to 的基本用法：have to 和 must 的意义相近，只是must 侧重表示说话人的主观看法，而 have to 则表示客观需要，如：I mus
12、t study hard.I had to give it up because of illness.6、ought to的基本用法（1）表示根据某种义务或必要“应当”做某事，语气比 should 强，例如：Everyone ought to obey the traffic regulations.（2）表示推测，注意与must 表示推测时的区别：He must be home by now.(断定他已到家)，He ought to be home by now.(不十分肯定)，This is where the oil must be.(比较直率)，This is where the o
13、il ought to be.(比较含蓄)；（3）“ought+have+过去分词”表示过去应做某事而实际未做。例如：You ought to have helped him.(but you didnt)这时，ought 与 should 可以互相换用。注意，在美国英语中ought to 用于否定和疑问句时to 可以省略。例如：Ought you smoke so much?You oughtn t smoke so much.7、dare的基本用法（1）dare(dared 为其过去式)作情态动词用时，主要用于否定句，疑问句和条件从句中，如：Dared he bread the traff
14、ic regulations again?（2）在现代英语中dare常用作行为动词，其变化与一般行为动词相同，如：She dares to stay at home alone at night.8、need的基本用法（1）need作情态动词用时，主要用于否定句和疑问句中，如：He neednt worry about us now.（2）need也可作为行为动词用，可用于肯定句，否定句和疑问句中，其后可接名词、代词、动名词或带to 的动词不定式为其宾语。如：You need to practise reading aloud every day.（3）neednt 后接完成式可以表示过去做了
15、一件本来不必要做的事情，如：-Did you answer the letter yesterday?-Yes,I did.-But you needn t have answered it.9、shall的基本用法（1）shall 用作情态动词时，用于第二、三人称，表示说活人的意愿，可表示“命令”、“警告”、“强制”、“威胁”或“允诺”等意，如：He shall go first,whether he wants to or not.（2）在疑问句中，shall 用于第一、三人称，表示说话人的征询对方意见或请求指示，如：Shall I open the door?10、should的基本用法
16、（1）should 作为情态动词可以表示“建议”或“劝告”，有“应该”之意，如：You should learn 名师资料总结-精品资料欢迎下载-名师精心整理-第 3 页，共 6 页 -学习资料收集于网络，仅供参考学习资料from each other.（2）should 后接完成式表示过去没有做到本来应该做的事情，或是做了本来不应该做的事情。如：You should have give him more help.11、will 的基本用法（1）用于各人称，可以表示“意志”或“决心”，如：I have told him again and again to stop smoking,but
17、he will not listen.（2）在疑问句中用于第二人称，表示说话人向对方提出请求或询问对方的意愿，如：Will you please tell me how to get to the Capital Gymnasium?（3）will 可以表示一种习惯性的动作，有“总是”或“会要”之意，如：Every morning he will have a walk along this river.12、would的基本用法（1）would 作为 will 的过去式，可用于各人称，表示过去时间的“意志”或“决心”，如：He promised he would never smoke ag
18、ain.（2）在疑问句中，用于第二人称，表示说话人向对方提出请求或许问对方的意愿时，比用will的气更加婉转，如：Would you like some more coffee?（3）在日常生活中，学用“I would like to”表示“我想要”或“我愿意”之意，以使语气婉转，如：I would like to do Ex.2 first.（4）would 可以表示过去的习惯动作，比used to正式，并没有“现已无此习惯”的含义。如：Last year our English teacher would sometimes tell us stories in English after
19、 class./During the vacation he would visit me every week.（5）表料想或猜想，如：It would be about ten when he left home./What would she be doing there?/I thought he would have told you about it.练习题1.If they _ to do this work,he might do it some other way.A.were B.should C.will D.can 2.I was told yesterday that
20、 the company _ me to Rome next week for a business conference.A.should have sent B.were going to send C.should be sending D.should send 3.Lets take a walk,_?A.will we B.dont we C.do we D.shall we 4.He was a good swimmer so he _ swim to the river bank when the boat sank.A.could B.might C.should D.was
21、 able to 5.I went to the doctors yesterday,I had to wait for half an hour before he _ see me.A.can B.may C.might D.could 6.-_ this book be yours?-No,it _ not be mine.It _ be his.名师资料总结-精品资料欢迎下载-名师精心整理-第 4 页，共 6 页 -学习资料收集于网络，仅供参考学习资料A.Can,must,may B.May,might,must C.Can,may,must D.Must,can,may 7.We d
22、idnt see him at the lecture yesterday.He _ it.A.mustnt attend B.cant have attended C.would have not attended D.needed have attended 8.They _ the plane,or perhaps they have been prevented from coming for some reason.A.can have missed B.may have missed C.can have lost D.may have lost 9.Since the groun
23、d is white,it _ last night.A.had snowed B.must have snowed C.must be snowing D.must have been snowing 10.You must be fifty,_?A.mustnt you B.neednt you C.arent you D.mnynt you 11.You must have seen him off yesterday,_?A.havent you B.didnt you C.mustnt you D.neednt you 12.-That must be a mistake.-No.i
24、t _ be.A.cant B.isnt able to C.can D.was able to 13.He had known the matter before you told him,so you _ have told it to him.A.mustnt B.cant C.neednt D.shouldnt 14.How _ so?A.dare you to say B.dare you say C.do you dare say D.dare to say 15.You are their teacher.You _ care of them.A.should to take B
25、.might to take C.ought to take D.need to take 16.She is studying medical science now but she _ a lawyer.A.used to be B.would be C.were D.had been 17.If you were in an English-speaking country,you,too,_ English every day.A.will be used to speak B.will be used to speaking C.must be used to speak D.wou
26、ld be used to speaking 18.I did not call to make my airline reservation(预订)but I _.A.should have B,may have C.must have D.shall have 19.As a girl,she _ get up at six every day.A.would B.will C.might D.should 20.Dont you remember that we _ to the cinema tonight?A.would go B.go C.are going D.will be gone 参考答案：语法复习十一：助动词与情态动词15 ABDDD 610 CBBBC 1115 BACBC 1620 ADAAC 2125 ACBBB 2630 ABBCC 3135 DDBAB 3640 ADBAA 名师资料总结-精品资料欢迎下载-名师精心整理-第 5 页，共 6 页 -学习资料收集于网络，仅供参考学习资料名师资料总结-精品资料欢迎下载-名师精心整理-第 6 页，共 6 页 -