非谓语动词---不定式

1、非谓语动词一不定式 原形动词前加to,构成动词不定式。不定式不做谓语，属非谓语动词。第一节 不定式的时态和语态一、不定式的时态1、时态的构成不定式常用的时态有：一般式，完成式和进行式。其构成见表（以do为例）：时态构成一般式to do完成式to have done进行式to be doing2、时态的用法（1）一般式的使用范围 不定式所示动作或状态与谓语动词所示的动作或状态同时或几乎同时发生或存在，用一 般式，如：I am glad to see you.高兴见至 M尔。I saw her enter the room just now.。我刚见他进房间去了。 不定式所示动作或状态发生在谓语动

2、词所示动作或状态之后，也用一般式，如：My uncle asked me to see him this summer.我叔叔要我今夏去看他。I am glad to take my younger sister to the countryside.我很高兴下星期天带我妹妹至U乡下去。（2）完成式的使用范围不定式所示动作或状态发生在谓语动词所示动作或状态之前，用完成式，如：I am glad to have see n your mother yesterday.我很高兴昨天见至 M尔母亲。He is said to have written a novel about the Long M

3、arch.据说他写了一本关于长征的小说。I regret to have been with you for so many years.我遗憾和你呆在一起这么多年。（3）进行式的使用范围当谓语动词的动作或状态发生时，不定式动词所示动作正在进行时，用进行式，如：They seemed to be talking about you.他们好像是在谈论你。The two workers pretended to be working hard.这两个骗子假装在拼命工作。You are said to be writing a paper on pollution. 据说你正在写篇关于污染的论文。二

4、、不定式的被动语态1、被动语态的两种时态其构成不定式被动语态常用于两种时态，一种是一般式被动语态，一种是完成式被动语态，见表（以do为例）：被动语态构成一般式to be done完成式to have bee n done（1）一般式举例：These students want to be sent to work in our company.这些学生想要分至U我们公司工作。（2）完成式举例：He is said to have been killed.据说他已被杀害了。The assista nt seemed to have been fired 这位助手好像被解雇了。三、不定式的主动语态

5、代替被动语态 在下列情况下，不定式可用主语语态代替被动语态：1、当不定式与最近的名词（代词）有动宾关系，且与句中另一名词（代词）有主谓关系,如：He has nothi ng to eat .他没有什么东西好吃。I will give you a book to read.我将给你一本书读。I have a lot of papers to type.我有许多文件要打。Would you bring me a bench to sit on? 给我拿条凳子来坐好吗？Please lend me a pen to write with.请借支钢笔给我用用。2、当不定式在“主语+表语（形容词）”结

6、构中作状语，且句中主语是这个不定式的逻辑宾 语时，如：This text is easy to recite.这课很容易背。The wash in g-mach ine is too expe nsive for me to buy.这台洗衣机对我来说太贵了，买不起。3、当不定式修饰there （here） be引导的句子中的主语时，如：There are two tractors to repair.有两台拖拉机要修理。Here is baby to take care of.有个婴孩要人照顾。当然也可用被动语态，如：There is nothing to fear（to be feared

7、 ）.没有什么好怕的。句中不定式如有逻辑主语，则只能用主动语态，如：There is nothing for us to fear.我们没有什么可怕的。4、to let, to blame,等不定式一般只用主动语态，如：The house is to let.房子要出租。I am to blame .我要受责的。第二节不定式的语法功能一、做主语（1）直接用作主语，如：How to get rid of these things is a big problem.如何清除这些东西是个大问题。Not to have a correct political point of view is like

8、 havi ng nor soul.没有正确的政治观点，等于没有灵魂。（2）用it代替不定式作形式主语，如：It is good to see all my teachers and friends again.又能见至U老师和朋友有多好。It is bad ma nn ers to be rude to people.对人粗鲁是不礼貌的。It is important for us to keep the balanee of nature。对我们来说保持自然界的平衡是很重要的。How much did it cost you to send the telegram?发这圭寸电报花了你多少

9、钱？It made us very happy to hear from him.收至U他的信使我很高兴。二、作宾语1、可用不定式直接作宾语的动词Wan t,like,wish,hate,prefer,hope,c ontinun e,refuse,ma nage,try,ask,offer,start,forget,promise,mea n, pretend,begin,decide,learn,agree,care,choose,determine,expect,afford 等动词可直接接不定式作 宾语，如：The crops begi n to grow.庄嫁开始生长。Jenney

10、tried to explain.詹妮试图解释。The boy pretended to have finished it.男孩假装做完了它。He decided to do some experiments to test Aristotle is theory.他决定做实验来证明亚里士多德 的理论。He wan ted to have a cup of tea.他想喝下午茶。2、需要it代不定式作宾语的动词find,make, think, consider ,feel等动词不能直接接不定式做宾语，需要it代不定式作形式宾语，如：He fou nd it importa nt to stu

11、dy the situation in Chi na 他发现研究中国的形势很重要。This has made it n ecessary for agriculture and in dustry to develop very quickly. 这就使得工农业 必须迅速发展。I thought it impossible to arrive there in half an hour.我认为半小时到达那儿是不可能的。I feel it my duty to say that you are wrong.我觉得我有责任说你是错的。三、作宾补1、不定式作宾补 John asked me to h

12、elp him with his lessons this evening.约翰请我今晚帮他复习功课。He ordered the hunter to bow before his hat.他命令猎人在他的帽子前鞠躬。（2） make ,have ,let 等使役动词以及 see ,watch, notice, observe, look at, feel, hear, listen to 等 感官动词可接不定式作其宾语的补语，但在主动语态中，不定式中的to应省略去，如：I can let you have one ticket.我能让你得到一张票。It made her feel bette

13、r.这使她感到好多了。Listen to me read the text.听我读课文。但在被动语态中，这个to不能省，如：The boy was seen to fall suddenly from the tree.人们看到这个小孩突然从树上掉下来。Was the thief noticed to leave the house?有人看见贼离开这幢房子吗？四、作状语 作目的状语，如：In those days people seldom did experiments to test their ideas. 在那个时候人们很少做实验来 检验他们的想法。She did all she co

14、uld to save him.她尽自己所能来救他。To master a Ian guage, words and grammatical rules are not eno ugh.要掌握一门语言，光单词禾口 语法规则是不够的。 作结果状语（表示意料之外的结果），如：They lifted a rock only to drop it on their own feet. 他们搬起石头砸自己的脚。 作原因状语，：在某些表示喜、怒、哀、乐等的形容词后作原因状语。如：I m sorry to hear your grandma is ill.听到你奶奶生病真遗憾。Im surprised to

15、 see you here .在这里见到你，真让我感到吃惊四、作表语不定式作表语很普遍，如：Her wish is to become a nurse.她的志愿是当个护士。So all the driver could do was to go back home.司机能干的就是回家。To him the most important thing is to save lives.对他来说，最重要的事就是救命。注意：在很多情况下，不定式作表语可转换为做主语，如：His job is to raise pigs.= To raise pigs is his job.养猪是他的工作。五、作定语1.

16、不定式作定语与它所修饰的名词存在下列三种关系： 动宾关系：不定式所修饰的名词是这个不定式的逻辑宾语，如：Has the visitor had anything to eat? 来访者吃了东西了吗？The cadre told me that he had an importa nt meeti ng to atte nd.这个干部告诉我他有个重要的会议要参加。注意：如果这个不定式是不及物动词，他后面应有必要的介词，如：My cousin hired a room to live in. 我表兄租了间房子住。There was no place for people to walk on.这儿

17、没有地方供人们散步。 主谓关系：不定式所修饰的名词是这个不定式的逻辑主语，如：The hunter isn a man to bow before difficulties. 这位猎人不是向困难低头的人。Her youn ger sister was the first girl to work out the problem.她妹妹是第一个解出这道题的女孩。 所属关系：不定式与所修饰的名词存在一种所属关系。可形成这种关系的名词有way,meed,time,pla n,right,cha nce,opport un ity,moveme nt,reas on, promise,wish,eff

18、ort,struggle等，如：Liu Mei is on her way to see a film.刘梅正在去看电影的路上。The farmers began to think of ways to kill hawks.农民们开始想杀死鹰的办法。2. 最高级，序数词或有最高级，序数词及only修饰的词后，非谓语动词中只能用不定式作定语.如：He is the oldest athlete ever to win an Olympic gold medal.第三节不定式应注意的问题1.不带to的不定式(1) 在 feel, hear, listen to, see, look at, wa

19、tch, notice, observe, make, let, have 等感官动词和使役动词后，动词不定式作宾语补足语时不带to,若句子为被动语态，不定式则应带to.help后可带也可不带to.(2) 在 had better, had best, would rather, would rather等a结构0后面用不i带to 的不定式.如:He in sisted on going back to his work rather tha n stay in hospital.在以why引导的简短疑问句中不带to.如：Why worry about it(4) 在 cannot choos

20、e but, cannot (help)but 之后的不定式不带 to.如：I canno t(help)but admire his courage.介词but, except之前有行为动词 do,其后的不定式不带 to,否则要带to.如:She could do nothing but cry.I have no choice but to accept the fact.(6)不定式作表语，若主语部分(含修饰主语的定语从句)已有行为动词do,可省略do.如：What a fire-door does is (to) delay the spread of a fire.What you

21、n eed to do now is (to) have a good rest.另外,help后的不定式无论作宾语还是作宾语补足语，均可省to.3. 注意作宾语时不定式与动名词在用法上和意义上的区别若干动词之后既可以跟动名词也可以跟动词不定式作宾语，但它们当中有些词在运用时，或是在特定的条件下有特别的用法要求，或是存在意义上的区别，列举如下：（1）当动词need, want, require作需要”解，且句子的主语与作宾语的非谓语动词是被动关系时,其后必须用动名词的主动形式表示被动意义，或用不定式的被动式作宾语如：The window n eeds （requires，wan ts） cle

22、a ning.The window n eeds （requires, wan ts） to be clea ned.在should （would） like/love/prefer/hate 后，习惯上用不定式作宾语 .如：Can I give a li ft No, thanks. I d prefe to walk.在begin和start的进行式之后，要用不定式.如:I m beginning to learn French.另外，当作它们宾语的动词为一些表示心理活动的识知动词时，应用不定式.如：I bega n to un dersta nd the importa nee of E

23、n glish.（4）forget, remember, go on, mean, regret, stop, try 等动词后可带动名词或不定式作宾语，但意义上有较为明显的区别.试比较： I remember reading the book.（记得过去曾有过的经历）I must remember to read the book.（别忘记届时去做某事 ） I ll try to improve my spoken English.（是努力力图的意思）Try knocking at the back door if no body hears you at the front door.（

24、是尝试的意思） Stop talking.（动名词即停止的内容）He stopped to talk.（不定式是停止的目的，即停下来去做某事） I mean to come early today. （表示打算）Missing the train means waiting for another hour. （ 表示意味着） I regret not having accepted your advice.（是对已做过的事表示后悔）I regret to say I haven t given you enough help.（表示对将要做的事表示遗憾，主要用于宣布坏消息.） Let s go on discussing the question.（讨论的是同一个问题 ）Lets go on to discuss ano ther questio n.（讨论的是另外的一个问题）4. 注意不定式与现在分词作宾语补足语时的区别1） .在 feel, hear, listen to, look at, notice, observe, s