态度等它很接近中文里能愿动词从用法上来说它有Word文档下载推荐.docx

1、例如：He can speak five languages .他会说五种语言。She must have arrived home by now .现在她准到家了。We should study hard for our motherland .我们应该为祖国而努力学习。They neednt be in such a hurry for there is enough time for them . 他们还有足够的时间，用不着这么慌张。1. 常用情态动词的基本用法can , could 能，会（could可以看作是can的过去式，这两个词除了时态不相同外，在表达意思的许多方面是相同的。当然

2、could也有自己独特的用法。）1）表示脑力或体力上的能力 Nobody can stop the development of science . 谁也无法阻止科学的发展。She can sing that song in English.她能用英文唱那歌。He can submerge to a depth of about twenty meters .他能潜入约二十米深的水中。He could hardly support his family before he found the new job .他在找到那份新工作前几乎无 法养家。I could not understand t

3、he lecture on the computer given by Mr. Smith .我听不懂史密斯先生作的那个关于计算机的讲座。2）表示客观上的可能性You can borrow this useful book from the library .你可以从图书馆借到这种有用的书。A more suitable person than him for the job can not be found . 不可能找到比他更适合这份工作的人了。Now people can skate on the lake .现在人们可以在湖上滑冰了。When the storm stopped , t

4、he plane could take off .当风暴停下来时，飞机可以起飞了不得。3）表示主观上的允许Can I ask you some questions about it ? 我可以问你有关这件事的几个问题吗？You can not leave here till I come back .直到我回来你才能离开。Such kind of thing cant happen any more later . 这类事以后不准再发生了。Can you tell me how to get to the airport ?你能告诉我怎么去机场吗？Could you tell me how t

5、o get to the airport ?您能告诉我怎么去机场吗？Could I be forgiven my negligence ?请原谅我的疏忽，行吗？4）（用于否定句、疑问句或感叹句中）表示猜测、怀疑或惊诧How can / could you be here ? 你怎么会在这儿？She couldnt / cant be so stupid to do that .她不可能蠢得去做那种事吧。He couldnt / cant be over seventy .他不可能有七十多岁了。Where could / can the boy be now ?那孩子现在能在哪儿呢？另外，cou

6、ld还常用于表示较客气委婉的看法、提问及用于虚拟语气的结构中。这时候，could就不可以看作是can的过去式了。而是could自己独特的用法。如：Could you speak a little slowly ?您能稍微说慢一点儿吗？Im afraid that we couldnt give you any definite answer at this moment .恐怕我们这时候还无法给予您任何确切的答复。I could come earlier if asked .如果要让我早一点来，我可以来早一点。We would appreciate it if you could offer

7、us any help . 如果您能为我们提供帮助的话，我们将不甚感激。You could have done better if you had worked harder at it . 如果你再加把劲，本来可以干得更好一些的。may , might 或许，可能，可以（might可以看作是may的过去式，这两个词除了时态不相同外，在表达意思的许多方面是相近的。当然may 和might又都有一些各自不同的独特用法。1）可能性 I may be busy from tomorrow on . 从明天起我可能会忙起来。You may catch sight of the sunrise from

8、 here when you get up before 5 in the morning . 你在早晨五点钟以前起来，或许能从这儿看到日出。I wondered if they might agree with the idea .我想知道他们是否会同意这种想法。She thought it might be wise to try her luck here .她认为在这儿碰碰运气也不错。2）表示允许 May I come in ? 我可以进来吗？Id like to have a smoke here if I may .如果可以的话我想在这儿抽一支烟。The librarian tol

9、d her that she might return the book to the library in three days .图书馆理员告诉她说，她可以在三天后还那本书。At the press conference , a news reporter asked the chairman if she might trouble him with a question about Taiwan issue. 在记者招待会上，一位新闻记者问大会主席她是否能提一个有关台湾问题方面的问题。3） may间或用来表示祝愿，也常用于表示目的或让步的状语从句中:May that day come

10、soon .但愿这天早日到来。May you succeed in winning the first prize in the game .祝愿你比赛夺冠成功。May you continue in your efforts and achieve greater successes .祝愿你继续努力并取得更大的成功。4） might也常用于表示目的等状语从句中，或用于虚拟语气的结构中:I could not convince him , try as I might .我无论用什么样的办法也不能说服他。They left off earlier on that day so that th

11、ey might catch the first train . 那天，他们为了赶上头班车动身早一些。He died so that the others might live .为了其他的人能活下去，他自己牺牲了。If you had made better use of your time , you might have learned more .假若你将自己的时间利用得更好一些，你本可以学到更多东西的。One error in calculation might ruin the whole project .计算中出一点错就可能毁掉整个工程。注意：在回答以may引导的问句时，一般说

12、来避免使用may，以免显得太严厉、或不太客气，而改用其他方式。May I come in ? Yes , please .请进。我可以进来吗？Sure . / Certainly . .请进。Please dont . .请不要进来。No , you mustnt .不行。must 应该，必须，一定1） 表示出于职责、义务该做某事 We must protect peoples rights .我们应该保护人民的利益。Everyone must be loyal to his motherland .每个人都应该忠于自己的祖国。You must serve the people when yo

13、u grow up .你们长大成人时应该服务于人民。Students must work hard at their study .学生应该努力学习。2）表示出于主观意识而必须要做某事We must speed up the pace of our economic reform .我们必须加速经济改革的步伐。We must keep steps to the scientific development .我们一定要与科学的发展保持一致步调。You must hurry up or youll be late .你必须得快点儿，不然会迟到的。在这种用法中must表示出于主观意识而必须要做某事

14、；have to却表示由于某种客观原因而不得不做某事。除此以外，have to自身有时态的变化形式。I have to go now for Ive got a meeting 15 minutes later.我现在必须要走了，因为我15分钟后有个会要开。He has to be back home by five to fetch his son from kindergarten .他必须在五点钟前回家去幼儿园接他的儿子。Jenny had to tidy up the room before her mother came back . 珍尼不得不在她妈妈回家以前将房间整理好。Well have to reconsider the whole thing .我们将不得不重新考虑整个事情。在这种用法中，回答以must引导的问句时，若是否定答复，不可以用mustnt 而需要用neednt 或是dont have to，因为mustnt意思是“绝不能、一定不要”，而没有“不必”的意思。Must we hand in our exercises today