语法不定式,动名词

1、动词不定式是由“不定式符号to+动词原形”构成的一种非谓语动词结构。有些动词不定式不带to,动词不定式可以作句子的主语、表语、宾语、定语、补语、状语或单独使用。不定 式保留动词的某些特性，可以有自己的宾语、 状语等。动词不定式和它后面的宾语、状语等一起构成短语，叫作不定式短语。现对九年级动词不定式的用法作一次简要梳理。一、用作主语直接把动词不定式置于句首的情况不多，多数情况用it作形式主语，把真正的主语一动词不定式置于句末，特别是不定式短语较长时。动词不定式作主语，谓语动词用第三人 称单数形式。带疑问词的不定式短语作主语常置于句首，复合不定式结构作主语常置于句末。如：1. As young a

2、dults, it is our duty to try our best to deal with each challe nge. (p.8)2. The head teacher said it was n ecessary to talk with his mother. (p.16)3. How to make requests politely is importa nt.(p.93)二、用作表语动词不定式作表语，常说明主语的内容、性质、特征。如：1. The best way to improve your En glish is to join an En glish club

3、. (p.7)2. The first thing is to greet the teacher. (p.96)三、用作宾语1. 可以接带to的动词不定式作宾语的动词主要有：要求选择同意(ask, choose, agree),期 望决定学习(expect, hope, decide, learn)，宁可假装知道(prefer, pretend, know)，希望想要愿意 (wish, want, would like / love)。如：1) We decided to talk to some stude nts about why they go there. (p.88)2) He

4、prefers to eat white bread and rice.(p.50)3) Id love to visit Mexico.(p.53)2. 动词decide, kno w, learn, show, teach, tell.，介词结构on.可用疑问词带to的不定式短 语作宾语，但 why后面的不定式不带to。如：1) Could you please tell me where to park my car?(p.92)2) It gives advice on what to do in lots of differe nt situati ons. (p.32)3. 动词f

5、eel, find, make, think等后面，可以用it作形式宾语代替真正的宾语动词不 定式，句子结构是 .feel / find / make / . it+adj. / n.+to do.。如：I find it difficult to remember everything. (p.98)4. 既可接动词不定式又可接ving形式作宾语，意思差别不太大的动词有begin, start, like,love等。一般说来，动词不定式表一次、数次的具体动作、将来动作或动作的全过程，ving形式表习惯性的连续动作。但是这种区别并不很严格，特别是美国英语，即使是习惯性的动作也可以用动词不定式

6、。如：1) Then I started to watch English-language TV .(p.6)2) I' m beg inning to un dersta nd my Chin ese roots, and who I am. (p.116)begin用了进行时态，后面只接不定式作宾语，表示事情刚开始，还要继续下去。3) I like to eat vegetables. (p.118)感知动词like, love, know 等一般不用进行时态。5. 后接动词不定式或 ving形式作宾语，意思差别较大的动词有forget, remember等。后接不定式作宾语，表

7、动作尚未发生；后接 ving形式作宾语，表动作已经发生。stop to do停下来做另外一件事，to do是目的状语；stop doing停止做、不做当前这件事，doing是宾语。try to do尽力做，try doing试试看；go on to do接着做另外的事，go on doing继续做原来的事。如：1) When I left home, I had forgotte n to bring it with me.(p.1O7)2) 1 stopped using them last year. (p.121)四、用作定语1. 句子的主语或宾语是动词不定式的逻辑主语，不定式与其所修饰

8、的名词、代词等存在 逻辑的动宾关系时，用动词不定式的主动式。如：1) 1 have so many chores to do today.(p.112)2) I cant thi nk of any good advice to give her. (p.31)3) Basketball has also become a more popular sport for people to watch.(p.75)2. 动词不定式所修饰的名词是place, time, way等时，不定式与这些名词呈现出动状关系或同位关系。如：1)He needs time to do homework.(p.1

9、9)2) Is that a good place to hang out ？ (p.88)3) You want to know the best way to get around the city.(p.127)3. 在“ there be.”句型里，句子的主语是动词不定式动作的对象，常用主动式。如：1) There' s just so much to see and do here.(p.49)2) . but there are still many things to do there.(p.54)五、用作补语动词不定式作补语时，在主动语态句里补宾语，在被动语态句里补主语

10、，句子的宾语或 主语是不定式动作的逻辑执行者。如果不定式是to be done，句子的宾语或主语就是逻辑承受者。1. 在主、被动语态句里用带 to的动词不定式作补语的动词主要有：要求允许提议(ask, allow, permit, advise)，期望邀请鼓励 (expect, suppose, invite, encourage)，教导告诉想要 (teach, tell, want)，等待希望愿意(wait for, wish, would like / love)。如：1) Id in vite her to have dinner at my house.(p.29)2) Tee nag

11、ers should be allowed to choose their own clothes. (p.18)3) Email En glish is supposed to be used on mobile phon es.(p.101)2. 动词不定式作补语，在主动语态句里不带to，被动语态句里带to时多数动词是感官动词和使役动词，包括四"看”：look at, observe, see, watch，三"让” ：have, let, make，二"听” :hear, listen to, "感觉” :feel，一"注意” :noti

12、ce。如：1) This picture makes me feel tense ！ (p.106)2) Of course we want to see Liu Yu achieve his dreams.(p.24)3. help后接动词不定式作补语，to可带可不带。一般说来，带to表间接帮助，不带 to表直接帮助。在被动语态句里，或者用不定式的否定式作补语时要带to。如：1) . they can help you to compare two differe nt products so that you can buy the one you really need.(p.106)2

13、) Us ing email En glish helps you write quickly. (p.100)4. be said, be sure, happen, seem等后面可以接带to的动词不定式作主语的补语。如：1) He does n' t seem to have many frien ds.(p.19)2) Be sure not to miss them if they come to a city n ear you.(p.114)六、用作状语1. 目的状语，置于句首或句末，置于句首时常表示强调。如：1) In order not to offend peopl

14、e, learning about Ianguage etiquette is just as important as learning grammar or vocabulary.(p.93)2) A group of young people got together to(i n order to / so as to) discuss this questi on. (p.50)to do / in order to do / so as to do用作目的状语，置句末时都可以用，置句首时只用to do/ in order to do。 so as to do 一般不置于句首，可以引

15、导结果状语从句，in order to do不引导结果状语从句。2. 原因状语，多见于"sb.+be+adj.+to do.”结构句中。如：1) My dogs name is “ Lucky ”一 a good name for him because I feel very lucky to have him.(p.66)2) 0n Mon day he told a radio in terviewer that he had run out of money to buy old bikes. (p.64)3. 结果状语，多见于"too.to”，“enough to

16、.”结构句中。如：1) Then I ' m too tired to do well. What should I do?(p.28)2) The room n eeds to be big eno ugh for three people to live in .(p.56)4. 有些动词不定式作状语，常说明前面形容词的性质和特性。动词不定式与句子的主语有逻辑的动宾关系。动词不定式前面的形容词一般是：cheap, dangerous, difficult, easy, fun,hard, in teresti ng, n ecessary。不定式常用主动式表被动意义。. the m

17、istakes you made are n ecessary for you to lear n and un dersta nd.(p.116)这类句子中的动词不定式可改为主语。5. 独立动词不定式多用作插入语，表示说话人的心理状态或对事情的看法。如：1) Id like to stay healthy, but to be hon est, I only eat food that tastes good.(p.50)2) To begin with, she spoke too quickly, and I couldn ' t understand every word. (

18、p.6)七、动词不定式的复合结构动词不定式的复合结构是"for / of sb. to do sth. ”，for/ of引出不定式动作的逻辑主语。这种结构在句子中可以作主语、宾语、表语、定语、状语等。不定式复合结构的介词用for还是of,主要决定于前面形容词的性质。一般说来，of前面的形容词是 careful, clever, foolish,good, kind, nice, wise等，既说明人的特性，又说明不定式动作的特性。for前面的形容词是dangerous, difficult, easy, hard, heavy, important, interesting, ne

19、cessary 等，一般说明不定式动作 的特性，不说明人的特性。前面如果是名词用for。如：1.Its also probably a good idea for parents to allow teenagers to study in groups during the evening. (p.22)2.Zoos are terrible places for ani mals to live.(p.120)八、带疑问词的不定式短语动词不定式前面可以带疑问代词what, which, who或疑问副词how, when, where, why等。这种结构起名词的作用，在句子里用作宾语、主

20、语、表语等，或者单独使用。要注意的 是，why后面的不定式不带to。如：1. 用作句子的成分。1) 1 don ' t know what to try next. (p.49)(作宾语)2) Where to go is not decided yet.(作主语)2. 单独使用时相当于一个特殊疑问句。1) What to do n ext?(=What will we / you do next?)2) Why go there?(=Why do we / you go there?)九、动词不定式的否定式不定式的否定式是 not / never to do.，不带to的不定式的否定

21、式是not / never do.如：.Sometimes they have disagreements, and decide not to talk to each other.(p.8)2.His pare nts tell him n ever to drive after drinking.英语中能接不定式作宾语的主要动词口诀(25个主要动词)三个希望两答应，hope, wish, expect, agree, promise两个要求莫拒绝。 设法学会做决定， 不要假装在选择。 打算提出俩计划， 申请失败负担起， 准备愿望又碰巧。dema nd, ask, refuse man a

22、ge, lear n, decide/determ ine prete nd, choose/select intend, offer, pla n, meanapply, fail, afford prepare, desire, happe nI hoped to have see n you in Paris last week. 我原指望上星期能在巴黎见到你。I wish to be forever with him.我希望能永远和他在一起。I expect to see you soon.我期盼着能马上见到你。Sally agreed to be my date toni ght.莎

23、丽同意今晚跟我出去约会。She promised to be a film star.她有希望成为一名电影明星。I dema nd to know why he had done it.我要求知道他为什麽做出这种事。Everyone asks to have a sweet life.每一个人都要求拥有甜蜜的生活。This is the reas on why he refused to accept the fact .这就是为什么他不想接受这个事实的原因。We fin ally man aged to get there in time.最后，我们设法及时赶到了那里。Anyone can

24、lear n to speak En glish.任何人都可以学着说英语。I decided to conq uer En glish from today!我决定从今天开始攻克英语！Jim has determined to work harder than before.吉姆下决心比从前更努力工作。She prete nded to be happy whe n she saw her father.她看到她爸爸的时候假装高兴的样子。Can you choose to fall?你真能选择堕落吗？I intend to improve my En glish test, because i

25、t is very bad. 我打算提高我的英语成绩，因为老是考得很糟糕。Never offer to teach fish to swim.不要教鱼游泳（不要班门弄斧）。I pla n to tran slate the no vel.我计划要翻译这篇小说。I did not mean to hurt your feeli ngs.我没有想要伤害你的感情。Intern ati onal stude nts can also apply to become reside nt assista nts after a year in the dorms. 国际学生也可以在宿舍住满一年后申请成为居

26、民助理的。He failed to seize the opport unity .他没有把握住那个机会。How can he afford to go abroad every year?他怎么能支付得起每年出国的费用？Do you prepare to accept the challe nge?你做好准备接受挑战了吗？Every man desires to live long, but no man would be old.人人都希望长寿，但没人愿意变老。I happe n to have an hon est partner.我碰巧有一个忠实的好搭档。口诀：三个希望两答应，两个要求

27、莫拒绝；设法学会做决定，不要假装在选择.点拨：三个希望两答应 ：hope, wish, want, agree, promise两个要求莫拒绝 :dema nd, ask, refuse设法学会做决定 :manage, learn, decide警告假装在选择：pretend, choose特殊动词接动名，使用它们要记清，放弃享受可后悔，坚持练习必完成，延期避免非介意掌握它们今必行习惯上只接动名词作宾语的动词有。如：admit承认advise建议allow允许appreciate 感激avoid避免consider 考虑delay推迟deny否认discuss 讨论dislike不喜欢enjo

28、y喜爱escape逃脱excuse原谅fancy设想finish完成forbid禁止orgive 原谅give up放弃imagine 想像keep保持mi nd 介意 miss 没赶上pard on原谅permit允许practise 练习prevent 阻止prohibit 禁止put off推迟report扌报告risk冒险stop停止suggest 建议un dersta nd 理解一、有些动词只能接不定式做宾语。例如：help， hope， ask, refuse, decide， promise，wish， prete nd, expect， lear n， pla n， man

29、age, agree， fail， offer，happen，seem 等等。例如： He refused to speak on the radio.二、有些动词或短语只接动名词做宾语：mind，finish，enjoy，suggest, consider，miss，keep(on)，avoid，stand(忍受)，allow ，practice give up, put off, look forward to , feel like , preventfrom , can't help, be/get used to , be worth doing , be busy doin

30、g 例如：His wife does n't allow smok ing in side the room and ofte n advised him to give up smok ing.I'm looking forward to hearing from you soon.She does n't feel like eat ing anything , being ill for a few days.三、 有些动词后面既可接不定式，又可接动名词，其意义基本相同，区别不大。如；like, love, hate, prefer. beg in, start.

31、注意：begin和start本身为进行时，或后面动词为心理变化意义的动词时，须接不定式。例如： When we came in, they were beg inning to have supper.After his expla nati on, I bega n to un dersta nd it / realize that I was wrong.四、有些词后面既可以接不定式亦可接动名词，但其意义有很大区别，须特别注意：A remember, forget，接动名词，表示完成意义 (=having done)，接不定式，表示将来意义： 例如： Please remember to

32、bring me the book I want next time. I remember seeing her (=havi ng see n her) somewhere before.B mean： mean to do=want to do 打算，想要;mean doing： 意味着，就是例如：I am sorry, I did n't mean to hurt your feeli ngs , Lear ning a foreig n Ian guage does n't mean just work ing in class.C. stop： stop to do

33、停下来，要干另一件事，不定式作目的状语；stop doing停止干，动名词作宾语。例如:After some time, they stopped walking and had a rest.After walking some time, they stopped to have a rest.D. try: try to do，努力，试图干事；try doing :试着干事。例口： He searched everywhereand tried to find his key. He came to the city from the coun tryside and tried to

34、find a job.E. want, need, require接动名词表示被动意义，表示"需要、该 ”；接不定式，表示”想，要干 "。 例如： The room wants cleaning.The matter needs thinking over.(=to bethought over)F. go on: go on to do继续干和原来不同的另一件事，不定式作目的状语。go on doing继续干原来同一件事，动名词作宾语。例如:After a smoke，he went on telling us that interestingstory.After wr

35、iti ng his En glish compositi on he went on to work out his maths problems.G. 动词advise, allow , permit, forbid后面接单宾语时用动名词，接复合宾语时 用动词不定式。例如：Doctors advise giv ing up smok ing to ben efit on e's health.The doctor advised him to give up smok ing so as to improve his health.She does n't allow(pe

36、rmit) smok ing in her room.=She does n't allow (permit)a nyone to smoke in her room.动名词可以接在动词和介词后作宾语。下列动词或词组后面要求接动名词作宾语，而不能接不定式作宾语：allow, mind, enjoy, avoid, finish, escape, practise, suggest, consider, forbid, advise,risk, miss, delay, admit, appreciate, un dersta nd, deny, en dure, excuse, imagi ne, give up, be used to （习惯于）,devote to, look forward to, insist on, put off, feel like, cant help （ 禁不住）,be busy （in）, be worth, keep on42个习惯上只接动名词作宾语的动词admit （承认），advise （建议），allow （允许），anticipate （预料），appreciate （感激），avoid （避免）,consider （考虑）,defer （延期）,delay （推迟）,deny （否认）,detest （讨厌）,discu