动词不定式
一、动词不定式的基本形式是“不定式符号to+动词原形”，有时可以不带to。动词不定式没有人称和数的变化。在句中不能单独作谓语，但仍保留动词的特性，可以有自己的宾语、状语等。动词不定式同它的宾语和状语一起构成不定式短语。
例如：to sell flowers in the street 在街上卖花to speak in the classroom 在教室里讲话
不定式省to有四种情况：
1、使役动词let, make, have等后接不定式。
例如：Let him go! The boss made the child labors work the whole night.
2、would rather, had better后。例如：You had better stay at home.
3、Why…/Why not…后。例如：Why not have a good rest on Sunday?
4、感官动词see, watch, look at, hear, listen to, smell, feel, find，notice 等后作宾语补足语，省to。
例如：I saw him dance.
注意：这些情况在被动语态中，不可省to. 例如：The child labors were made to work the whole night.
二、动词不定式具有名词、形容词和副词的特征，可以作句子的主语、表语、宾语、宾语补足语、定语和状语。
1、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——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。
例如：The head teacher said it was necessary to talk with his mother.
How to make requests politely is important.
2、用作表语
动词不定式作表语，常用在be动词及seem, appear, happen等词之后，构成系表结构。说明主语的内容、性质、特征。例如：The best way to improve your English is to join an English club. She seem to be well-known.
3、用作宾语
○1. 用作宾语的动词不定式，常用在动词ask, choose, agree，expect, hope, decide, learn，prefer, know，wish, want, would like / love等及物动词之后，构成动宾短语。
例如：We decided to talk to some students about why they go there.
He prefers to eat white bread and rice. I’d love to visit Mexico.
○2.动词feel, find, make, think, believe等，在语法上不能接受不定式作宾语，只有用it作形式宾语，从而把动词不定式后置。句子结构是：主语＋feel / find / make / ... it+adj. / n.+to do...。
例如：I find it difficult to remember everything.
○3.既可接动词不定式又可接v-ing形式作宾语，意思差别不大的动词有begin, start, like, love等。一般说来，动词不定式表一次、数次的具体动作的全过程，v-ing形式表习惯性的连续动作。但这种区别并不很严格，特别是美式英语，即使是习惯性的动作也可以用动词不定式。
例如：Then I started to watch English-language TV.
I’m beginning to understand my Chinese roots, and who I am.
（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。）
○4.后接动词不定式或v-ing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，表动作尚未发生；后接v-ing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。例如：When I left home, I had forgotten to bring it with me.
I stopped using them last year.
○5后只接v-ing作宾语的一些常用特殊动词：give up, enjoy, practice, finish, mind等。
例如：Would you mind opening the window?
4、用作定语
用作定语的动词不定式一般都位于被修饰的名词之后。
例如：I have so much homework to do today. I cant think of any good advice to give her.
通常chance, place, time, way等名词后接不定式作定语。另外在the first, the second, the last, the only等词后，也常用不定式作定语。
例如：He needs time to do homework. You want to know the best way to get around the city.
5、用作补语
○1.常见动词不定式作宾语补足语的动词主要有：要求允许提议警告（ask, allow, permit, advise，warn），期望邀请鼓励（expect, suppose, invite, encourage），教导告诉想要（teach, tell, want），希望愿意（wish, would like / love）。
例如：I invited her to have dinner at my house. Teenagers should be allowed to choose their own clothes.
○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，一“感觉”：feel，一“注意”：notice。
例如：This picture makes me feel tense！Of course we want to see Liu Yu achieve his dreams.
○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。
例如：They can help you to compare two different products so that you can buy the one you really need.
Using e-mail English helps you write quickly.
○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。
例如：He doesn’t seem to have many friends.Be sure not to miss them if they come to a city near you.
6、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。为加强语气，常与in order或so as 组成短语。
例如：A group of young people got together to discuss this question.
In order to help him, we would do everything we can.
注意：置于句首时只用to do / in order to do。
○2.原因状语，多见于“sb.+be+adj.+to do...”结构句中。
例如：I was very sad to hear the news.
On Monday he told a radio interviewer that he had run out of money to buy old bikes.
○3.结果状语，多见于“too...to”，“enough to...”结构句中。
例如：Then I’m too tired to do well. He is old enough to go to school .
○4.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。
例如：I’d like to stay healthy, but to be honest, I only eat food that tastes good.
To begin with, she spoke too quickly, and I couldn’t understand every word.
7、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, necessary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。
例如：Its also probably a good idea for parents to allow teenagers to study in groups during the evening.
It’s kind of you to help me.
8、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。
例如：I don’t know what to try next. （作宾语）Where to go is not decided yet.（作主语）
注意：单独使用时相当于一个特殊疑问句。
What to do next?(=What will we / you do next?) Why go there?(=Why do we / you go there?)
9、动词不定式的否定式
不定式的否定式是not / never to do...，不带to的不定式的否定式是not / never do...
例如：Sometimes they have disagreements, and decide not to talk to each other.
His parents tell him never to drive after drinking.
巩固练习：
( )1、He read the instruction to find out how ____ the computer.
A. use
B. to use
C. using
D. uses
( )2、There are some d angerous fishes in this river, and I’ve warned Jack ____here.
A. not to swim B .to not swim C. swim not to D. to swim not
( )3、The article said that he hoped ____ drawing the picture soon.
A. his son to finish
B. to finish
C. finish
D. his son will finish
( )4、Listen! Can you hear a baby ______ ?
A. cry
B. to cry
C. crying
D. cries
( )5、“Don’t always make Michael _____ this or that. He is already a big boy, dear,” Bush said to his wife.
A. do
B. to do
C. does
D. did
( )6、Don’t forget _____ the letter. A. to send B. send C. sending
( )7、John was made ______ the car for a week as a punishment.
A. to wash
B. washing
C. wash
( )8、Thank you very much _____ the present.
A. to give me
B. for giving me
C. giving me
( )9、I have no paper. Could you give me a piece of paper ___ ?
A. to write in
B. write in
C. to write on
( )10、The teacher got his students _____ the top of the mountain.
A. reach
B. to reach
C. reaching
( )11、If everyone makes a contribution to _____ the environment, the world will become much more beautiful.
A. protect
B. protecting
C. protected
( )12、Tracy can’t play the match now. Please _____ instead.
A. have Lily do
B. let Lily to do it
C. make Lily to do it
( )13、We lock the door to keep the books _____ .
A. to be stolen
B. from being stolen
C. from stealing
( )14、On my way home, I stopped _____ some food. A. buy B. to buy C. buying
高中英语动词不定式用法大全(名师总结必考语法知识点，值得下载) 英语动词的非谓语形式为三种：动词不定式、动名词和分词。非谓语动词没有人称和数的变化。 动词不定式是一种非谓语动词形式，其结构为“to＋动词原形”，其中to 不是介词，而是动词不定式的符号，称为小品词，动词不定式没有人称和数的变化。动词不定式和其后面的名词等构成不定式短语，在句子中可以用作主语、表语、宾语、补足语、定语、状语等。 一. 作主语例如： To be a doctor is hard. 做医生很难。 To learn English well is not easy. 学好英语不容易。 To say is to believe.眼见为实。 动词不定式（短语）作主语时，为了避免句子的头重脚轻，可以用“it”作形式主语，而把真正的主语－－动词不定式（短语）放在句子的后部。例如上面的句子可以表示为： It is hard to be a doctor. It is not easy to learn English well. 再如： It’s important to pla nt trees in spring. 如果动词不定式的动作是谁做的，可以在动词不定式前面加一个由介
词for引导的短语，称为不定式的复合结构。例： It’s good for us to read English aloud in the morning. 对我们来说每天早晨大声读英语是很有益的。 It is important for students to use English every day. 对学生来说每天使用英语是很重要的。 二. 作表语：（在形式上，位于系动词后的就是表语。从含义上讲，表语是回答主语“是什么”或“怎么样”的语法成分。） 动词不定式（短语）作表语常用于系词be的后面。例： His work is to drive a car. 他的工作是开车。 My job is to feed animals. 我的工作是饲养动物。 Her ambition is to be a doctor. 她的理想是当医生。 三. 作宾语 动词不定式（短语）可以放在一些动词后面用作宾语，能以动词不定式作宾语的动词有：begin, start, want, forget, remember, show, learn, like, hate, love, ask等。例： I want to tell you a story. 我想给你讲个故事。 They begin to work at eight every morning. 他们每天早晨8点开始工作。 Don’t forget to lock the door.别忘了锁门。 Would you like to go and have a picnic with us tomorrow?明天和我们一
不定式用法详解 定义：在句子中充当除了谓语以外的各种句子成分的动词形式叫做非谓语动词。 非谓语动词有三种：不定式，动名词，分词。 注：非谓语动词具有时态和语态的变化，可以同否定词not连用，构成否定形式，可以带宾语，状语，补语。非谓语动词的名词，形容词，副词的特征；可用在句中做主语，宾语，补语，状语，和定语等。 —不定式（原形动词前加to, 构成动词不定式。不定式不做谓语，属于非谓语动词） 不定式的时态，语态 一般式：不定式所表示的动作和谓语动词所表示的动作或状态同时发生或几乎同时发生或存在。但多数情况下是在谓语动词所表示的动作之后发生。 e.g :They often watch us play football. (同时) She hopes to go there again. (之后发生) 完成式：不定式所表示的动作或状态发生在谓语动词所表示动作或状态之前。 e.g : I’m glad to have seen your mother yesterday 注：1）用在intended, expected, meant, hoped. promised, wanted, planned. wished. thought, desired, was, were等后，表示过去没有实现的愿望，期待或计划的等，也用来表示先于谓语动词发生的动作或状态。 e.g: He wanted to have met (=had wanted to meet) you at the airport,but he didn’t get there in time. 他原想去机场接你（事情已经发生），但他没及时赶到那儿。（没接成） e.g: We planned to have done (had planned to do) good deeds for the poor people last month. 我们原计划上个月为贫困的人们作些好事。（没作成）。
初中不定式todo的用法
1. 不定式的用法------1.1 不定式作主语 不定式作主语，往往用it作形式主语，真正的主语不定式放至句子的后面。 例如：It's so nice to hear your voice. 听到你的声音真高兴。 It's necessary for you to lock the car when you do not use it. 不用车的时候，锁车是有必要的。 It's very kind of you to help us. 他帮助我们，他真好。 It seemed selfish of him not to give them anything. 他不给他们任何东西，这显得太自私了。 但是，用不定式作主语的句子中还有一个不定式作表语时，不能用It is… to…的句型。另外，这样的句子，不能用动名词作表语。例如： （对）To teach is to learn. （错）It is to learn to teach. （错）To teach is learning. （错）Teaching is to learn. 典型例题 The chair looks rather hard, but in fact it is very comfortable to ___. A. sit B. sit on C. be seat D. be sat on 答案：B. 如果不定式为不及物动词，其后应有必要的介词。当动词与介词连用时，常位于"形容词+动词不定式"结构的末尾。 1.1.1 不定式做主语It's for sb/It's of sb to do sth 这样的句子中，由于表语形容词性质的不同，导致了不定式逻辑主语标志用for或of 的区别。 1）for sb.句型中的形容词一般为表示事物的特征特点，表示客观形式的形容词，如easy, hard, difficult, interesting, impossible等：例如： It's very hard for him to study two languages. 对他来说学两门外语是很难的。
1．carry on\keep doing 坚持做某事 2. practise doing sth. 练习做某事 3. keep sb. Doing 使某人一直做某事 4. enjoy doing 喜欢做某事 5. finish doing 完成做某事 6. be afraid of doing 害怕做某事 be busy doing 忙于做某事 9. how about doing//what about doing 做某事怎么样 10. spend some time (in)doing 花时间做某事 11. spend some money (in) buying 花钱做某事 12. feel like doing 想做某事 13. stop/keep/prevent …from doing 阻止某人做某事 14. thank sb for doing 感谢某人做某事 15. thanks for doing 感谢做某事 16. do some cooking/cleaning/reading/shopping/was hing 做点饭、打扫一下卫生、读点书、逛逛街、洗洗衣服 17. go swimming/fishing/shopping/skating/boat ing 去游泳、钓鱼、逛街、滑冰、划船18. mind doing 介意做某事 can’t help doing 情不自禁做某事21. have fun/difficulty/trouble/problem doing sth. 做某事有趣、有困难、有困难、有困难 22. waste time/money doing 浪费时间、钱做某事 23. instead of doing 代替做某事 24. miss doing 错过做某事 含有不带to的动词不定式句型： 1. had better (not) do sth. 最好（不）做某事 2. would you please (not) do sth. 你可以做某事吗？ 3. why not do sth. 为什么不做某事？ 4. why don’t you do sth. 为什么你不做某事？ 5. Shall we do sth.? 我们要做某事吗？ 6. let sb do sth. 让某人做某事 7. make/have sb. do sth. 使某人做某事含有带to的动词不定式句型 1. It’s time to do sth. 现在是做某事的时候了 2. It takes sb. some time to do sth. 做某事花了某人时间 3. tell/ask/want/encourage/invite/ sb. to do sth. 告诉、叫、想、鼓励、邀请某人做某事 4. Would you like to do sth.? 你想做某事吗/ 5. It’s good/bad to do sth. 做某事好、不好 6. It’s good/bad for sb.to do sth. 某人做某事好、不好 7. be+adj.+enough to do sth. 足够+形容词做某事 8. sb. is ready to do sth. 某人准备好做某事 9. It’s+adj.+ for sb. to do sth. 做某事对某人+形容词（做这件事对你好）10. It’s+adj.+ of sb. to do sth. 某人做某事+形容词（你做这件事真好）11. would like/love /decide/want/wish/to do sth. 想、喜欢、决定、想、希望做某事 12. would like/love sb. to do sth. 想、喜欢某人做某事 13. Prefer to do sth. rather than do sth. 宁愿做某事而不愿做某事 I prefer to stay at home rather than go out. 我宁愿呆在家里不愿出去 14. how/ when/where/whether to do sth 怎么、什么时候、在哪里、要不要做某事 15. can’t wait to do 迫不及待做某事 16. too …to do …太怎么样而不能做某事 17. be afraid /ready/able/sure to do 害怕、准备、能够、确定做某事
动词不定式用法大全 英语动词的非谓语形式为三种：动词不定式、动名词和分词。非谓语动词没有人称和数的变化。 动词不定式是一种非谓语动词形式，其结构为“to＋动词原形”，其中to 不是介词，而是动词不定式的符号，称为小品词，动词不定式没有人称和数的变化。动词不定式和其后面的名词等构成不定式短语，在句子中可以用作主语、表语、宾语、补足语、定语、状语等。 一. 作主语例如： To be a doctor is hard. 做医生很难。 To learn English well is not easy. 学好英语不容易。 To say is to believe.眼见为实。 动词不定式（短语）作主语时，为了避免句子的头重脚轻，可以用“it”作形式主语，而把真正的主语－－动词不定式（短语）放在句子的后部。例如上面的句子可以表示为： It is hard to be a doctor. It is not easy to learn English well. 再如： It’s important to plant trees in spring. 如果动词不定式的动作是谁做的，可以在动词不定式前面加一个由介词for引导的短语，称为不定式的复合结构。例： It’s good for us to read English aloud in the morning. 对我们来说每天早晨大声读英语是很有益的。 It is important for students to use English every day. 对学生来说每天使用英语是很重要的。 二. 作表语：（在形式上，位于系动词后的就是表语。从含义上讲，表语是回答主语“是什么”或“怎么样”的语法成分。） 动词不定式（短语）作表语常用于系词be的后面。例： His work is to drive a car. 他的工作是开车。 My job is to feed animals. 我的工作是饲养动物。 Her ambition is to be a doctor. 她的理想是当医生。 三. 作宾语 动词不定式（短语）可以放在一些动词后面用作宾语，能以动词不定式作宾语的动词有：begin, start, want, forget, remember, show, learn, like, hate, love, ask等。例： I want to tell you a story. 我想给你讲个故事。 They begin to work at eight every morning. 他们每天早晨8点开始工作。 Don’t forget to lock the door.别忘了锁门。 Would you like to go and have a picnic with us tomorrow?明天和我们一
动词不定式的用法讲解 一、动词不定式： 构成：to + 动词原形（to只是不定式符号，没有意义） 动词不定式作主语较长时，常用it作形式主语，而将真正的主语放在句末。 1.It + is/was+形容词+(for sb.) +动词不定式 To learn English well is useful. = It’s useful to learn English well.学好英语是有用的。 To protect environment is important for us. = It’s impor tant for us to protect environment.对于我们来说保护环境是很重要的。 2. It is / was + kind / good/ nice/ clever + of sb. + 动词不定式 It’s very kind of you to help me. 你帮助我真是太好啦。 It’s very clever of you to do like that. 你那样做真的太聪明啦。 3. It takes ( took , will take ) sb. some time to do something. (做某事花费某人…时间) 4.It is a good idea to do sth. 作宾语 1.常见的跟不定式作宾语的动词有： want to do sth. decide to do sth. hope to do sth. plan to do sth. offer to do sth. agree to do sth. learn to do sth try to do sth prefer to do sth promise to do sth. need to do sth. expect to do sth. 2. 主语+ find / think + it +形容词+ (for sb.) + to do I find it easy to read English every day. 我发现每天读英语和容易的。 He felt it hard to sleep.他觉得很难入睡。 I think it very interesting to learn English. 我认为学英语很有趣。 We found it impossible to cross the river. 我们发现过河是不可能的。 3.特殊疑问词+动词不定式作宾语 Can you tell me how to get to the post office? I didn’t know what to do next.
英语动词不定式完成式在使用语境中的学习与考查 江苏省沛县湖西中学鹿俊先221611 综观近年的英语高考试题，我们可以看到题目的设置往往强调语言知识在特定语境中的使用，把语言知识放在了语用层面上，即考察实际应用知识的能力。 英语动词不定式的完成式，即(to) have +动词的过去分词形式，是中学英语学习中的重点及难点知识之一，也是高考试题中频繁出现的形式。对于这一形式考查的题目设置通常围绕三类语境，即陈述已经发生过了的事实，推测可能已经发生过了的事实，表达与过去实际情况相反的事实。下面分别加以叙述，以便从语用角度掌握这一语言知识。 1.陈述已经发生过了的事实。 1.1.置于表示情感反应的动词、形容词、分词之后，作为引起该反应的刺激，表示情感反应之前完成的动作。例如： I'm sorry to have given you so much trouble. (=I'm sorry that I gave / have given you so much trouble.) It is good to have finished work for the day. (=I am pleased because I have finished.) She said she was sorry to have missed you. (=She said she was sorry that he had missed you.) There was a smile on the boy's face, which seemed to show that he was happy to have given his life to his country. (=…he was happy that he had given his life to his country.) 1.2.置于be said, be considered, be believed, seem, appear, happen, turn out,等之后表示这些动作之前完成的动作。例如： I don't know whether you happen to have heard, but I am going to study in the U.S.A. this September. Charles Babbage is generally considered to have invented the first computer. (=It is generally considered that Charles Babbage invented the first computer.) He is said to have studied abroad, but I don't know which country he studied in. (= It is said that he studied abroad, b ut….) I appear to have made a small mistake. (=It appears that I made / have made a small mistake.) He seems to have missed the train. (=It seems that he missed the train.) 1.3.置于should之后，表达说话人对已发生了的事实的情感的反应，如惊奇、遗憾、喜悦、不安、失望，等，should相当于汉语中的“竟然”，“居然”。例如：They were surprised (that) a child should have worked out the problem while they themselves couldn't. It is strange that she should have married such an old man. 2.推测可能已经发生过了的事实。 2.1.置于must, will, would, can't, couldn't 之后，表示很有把握的推论。例如： The city must have been prosperous, for it enjoyed a high level of civilization. An ambulance is waiting in the street. Somebody must have been hurt or killed. --I met her soon after the war.
动词不定式用法总结 动词不定式的构成是to+动词原形，但to 有时可以省略。它是一种活跃的非谓语动词形式，很多同学把它和谓语动词混在一起，掌握起来有困难。下面我们就对动词不定式做出简单归纳，帮助同学们记忆。 一、不定式作主语 在英语中，很多情况下，我们用代词it来代替不定式作主语，而把不定式移到句子的后部以平衡句子。此句式中不定式逻辑上的主语可由for或of引出。 ( )1.It’s our duty ____the room every day . A.to clean B.cleaned C.clean D.cleans ( )2.It’s very nice _____you to get me two tickets _____the World Cup. A.for,of B.of ,for C.to,for D.of ,at 二、不定式作宾语 常见类型如下： 1）动词+带to的动词不定式。常见的有：afford，agree，decide，expect，hope，want，fail，plan等，例如： ( )3.He wants _____some vegetables . A.buy B.buying C.to buy D.buys 2）动词+疑问词+带to的动词不定式。 ( )4.There is no difference between the two words .I really don’t know ______. A.what to choose B.which to choose C.to choose which D.to choose what 另外，动词不定式用作宾语时，如果后跟形容词作宾语补足语，在这样的复合宾语 中，常把it放在宾语的位置作形式宾语，而把不定式放在句尾平衡句子。例如： ( )5.He found it very different_________. A.sleeping B.sleeps C.fall asleep D.to fall asleep 三、不定式作宾语补足语 作宾语补足语的句型也有两个。 1）动词+宾语+带to的不定式。常见的这类动词有：ask ，teach，tell，want，like，advice，invite，allow，warn等。例如： ( )6.Robert often asks us ____his Chinese ,so his Chinese is much better than before . A.help him B.to help him with C.to help with D.helps him with 2）动词+宾语+不带to的不定式。常见的这类动词有：see，hear，watch，notice，let，make，等，例如： ( )7.We saw him ___into the building and go upstairs. 四、** come https://www.doczj.com/doc/2c8758208.html,e https://www.doczj.com/doc/2c8758208.html,ing D.came 不定式作定语 不定式作定语，要放在它所修饰的名词或代词的后面。例如： ( )8.---Would you like sonething_____? ----Yes ,please. 五、** B.drinking C.to drink D.drinks 不定式作状语 不定式及其短语具有副词的特性，可在句中用作状语。放在句尾或句首表示目的；也可跟在作表语的形容词或过去分词的后面，还可用于enough to---，too---to等结构中，例如： ( )9.She is old enoigh ____the things she likes.
动词不定式的基本用法 一、概述 动词不定式是一种非谓语动词形式，它能起名词、形容词和副词的作用，在句子中作主语、宾语、定语、表语、宾语补足语和状语。其形式如下：（主动形式） ◆一般式（not）to do 一般现在时表示的动词有时与谓语动词表示的动作同时发生，有时发生在谓语动词的动作之后。 He seems to know this. 我希望再见到你。_____________________________________________________ ◆完成式（not）to have done 完成时：表示的动作发生在谓语动词表示的动作之前。 He seems to have caught a cold. 很抱歉给你带来这么多的麻烦。____________________________________________ ◆进行式（not）to be doing 进行时：表示动作正在进行，与谓语动词表示的动作同时发生。 He seems to be eating something. 他假装在学习。_______________________________________________________________ 二、动词不定式的语法功能 （一）作宾语 1) 动词+ 不定式 The driver failed to see the other car in time. 司机没能及时看见另一辆车。 我碰巧知道你那道问题的答案。 ____________________________________________________________________ ★常用的动词有afford, aim, appear, agree, arrange, ask, decide, bother, care, choose, come, dare, demand, desire, determine, expect, hope, fail, happen, help, learn, long（渴望）, mean, manage, offer, ought, plan, prepare, pretend, promise, refuse, seem, tend, wish… 2）动词+疑问词+ to Please show us how to do that. 请演示给我们如何去做。
动词不定式的用法荟萃 不定式在句子中可做主语、宾语、表语、定语、状语和宾语补语。 1)不定式做主语一般表示具体的某次动作。 【例如】 To complete the 30storied building in one year was quite a difficult task. To do that implies taking responsibility. 当主语较长，谓语较短时，常用it做形式主语，而将不定式放到 谓语的后面。 【例如】 It is important for modern young people to master at least two foreign languages. It做形式主语，不定式放在谓语动词之后常用于下列结构中： a) It is＋形容词(easy, important, difficult, foolish,
inconvenient, unnecessary, right, wrong...)＋( for/of sb.)＋ 不定式 【例如】 It is essential to reserve a table in advance of Christmas Eve. hard to put my hopessintoswords. It is not easy to catch fish with your hands only. It is important for us young people to learn English and master it. b) It is＋名词(a pleasure, a pity, a pleasant thing, one’s du ty, an honor, a shame, a crime, no easy job...) ＋不定式 It is a sheer waste of time to read that kind of trash. It is a pity to have to go without her. It is a glorious death to die for the people.
高中英语语法讲解不定式 （The Infinitive） 定义：动词不定式是非谓语动词的一种，它没有人称和数的变化，在句子中不能独立作谓语，但它仍保持动词的特点，既可以有自己的宾语和状语。 E.g. He want his students to read the book aloud. A． 1 2 不定式的意义 不定式的一般式(to do ) 一般式表示的动作或状态，发生在谓语动词表示的动作或状态的同时或之后My wish is to become a doctor He seemed to be tired. She stopped to have a rest. 不定式的被动式 (to be done) 当不定式的逻辑主语是这个不定式所表示的动作的承受者时,不定式一般要用被动式. The building to be finished next month is for our teachers. I am going to Beijing, I have something to take to my parents, do you have something to be taken to your parents? 如果谓语表示的动作(情况)发生时, 不定式表示动作正在进行,这时候不定式就要用进行式.（to be doing） They are said to be building another bridge across the street. They seemed to be talking about something important. When I went to his home, he happened to be traveling around the world. I’m glad to be working with you. 如果不定式所表示的动作或状态发生在谓语动词所表示动作或状态之前，就用完成式 (to have done) ；若是在此基础上的被动含义，就用完成被动式( to have been done). He is said to have written a novel about the Long March. He thought it a pity not to have invited us. The assistant seemed to have been fired. He is said to have been taught French when he was a child. Einstein is said to have built up his theory when he was in his twenties. 如果不定式的动作是在谓语所表示的时间之前一直在进行的动作，就要用完成进行式. They are said to have been collecting folk song in Xinjiang. We’re happy to have been working with the experts all the month.
动词不定式用法小结 动词不定式用法小结 动词不定式是一种非谓语动词形式，其结构为“to＋动词原形”，其中to不是介词，而是动词不定式的符号，称为小品词，动词不定式没有人称和数的变化。动词不定式和其后面的名词等构成不定式短语，在句子中可以用作主语、表语、宾语、补足语、定语、状语等。 一. 作主语例如： To be a doctor is hard. 做医生很难。 To learn English well is not easy.学好英语不容易。 动词不定式（短语）作主语时，为了避免句子的头重脚轻，可以用“it”作形式主语，而把真正的主语－－动词不定式（短语）放在句子的后部。例如上面的句子可以表示为： It is hard to be a doctor. It is not easy to learn English well. 再如： It’s important to plant trees in spring. 如果动词不定式的动作是谁做的，可以在动词不定式前面加一个由介词for引导的短语，称为不定式的复合结构。例： It’s g ood for us to read English aloud in the morning. 对我们来说每天早晨大声读英语是很有益的。 It is important for students to use English every day. 对学生来说每天使用英语是很重要的。 二. 作表语： 动词不定式（短语）作表语常用于系词be的后面。例： His work is to drive a car.他的工作是开车。 My job is to feed animals.我的工作是饲养动物。 Her ambition is to be a doctor.她的理想是当医生。 三. 作宾语 动词不定式（短语）可以放在一些动词后面用作宾语，能以动词不定式作宾语的动词有：begin,start,
动词不定式用法讲解 1、构成及特征 动词不定式(infinitive)是动词的一种非限定形式，即非谓语动词形式，它有两种形式：一种是“to + 动词原形”构成（to- infinitive）；另一种是不带to的不定式,即动词原形(bare- infinitive)。所有行为动词都有不定式形式，其否定式是在不定式前加not。动词不定式（或不定式短语）没有人称和数的变化，在句子中不能作谓语。动词不定式仍保留有动词的特点：（1）可以有时式和语态的变化，也可以有自己的宾语或状语，它们一起构成了不定式短语。He tried to work out the problem in five minutes.他试图在五分钟之内算出这道题。（带宾语和状语） The factory to be built here next year is a car factory.明年在这里建的工厂是一家汽车制造厂。（有语态的变化） （2）动词不定式还具有名词、形容词和副词的特征，在句中可以作主语、宾语、表语、补语、定语、状语等成分。 He wants to study English.他想学英语。（to study English在句中作want的宾语，而to study又有自己的宾语English, to study和English一起构成了不定式短语。）Never to offend anyone is his principle.不得罪人是他的原则。（不定式作主语） 注意：不定式在许多场合具有情态意义。作主语时，相当于一个带有情态动词的主语从句；作宾语时，相当于一个带有情态动词的宾语从句；作定语时，相当于一个带有情态动词的定语从句；作目的状语时，相当于so that 或in order that引导的目的状语从句。 It is right for her to say so.(= It is right that she should say so.)她这样说是对的。 He has a lot of work to do.(=…that he should do)他有很多工作要做。 I don’t know where to get the ticket.(= …where I could get the ticket.)我不知道哪
“情态动词+不定式完成式”用法解析 【摘要】本文在分析历年高考中有关“情态动词+不定式完成式”试题的基础上，总结了“情态 动词 +不定式完成式”结构常见的几类用法，并辨析了其联系与区别。 【关键词】情态动词，不定式完成式 情态动词的“情态动词 +不定式完成式”结构是英语语法中的难点。在掌握情态动词基本用法的基础上，学习者需进一步结合各种句式与虚拟语气的用法才能更容易理解“情态动词+不定式完成式”这一结 构。 一、“情态动词+不定式完成式”结构表示对过去发生的事实的可能性的推测 当“情态动词 +不定式完成式”结构表示推测过去某动作发生的可能性时，在这些情态动词中，就表示的可能性程度而言， must最大， will ／would其次， should／ought to再次，could又次之， may更次之， might 最小（杨兆民， 1993）。 1．may／might+have+过去分词 “ may／ might+have+ 过去分词”译为“也许已经” ，表示对过去发生的动作或存在的状态的推测，其表示可能性的语气最弱；该结构的否定形式可译为“当时也许没有” 。表示可能性时一般用 might 指过去，用 may 指现在； may 有时也可用于完成式或完成进行式，指过去发生的动作或过去持续的动作。另外，“ may+have+过去分词”含有“至今可能仍存在”的意思；might 只用于间接引语中（薄冰， 1998）。例如： You may have read some account of the matter. 你也许读过关于这件事的一些报道。 He may have been waiting for us for an hour. 他也许等我们一个小时了。（指持续的动作） Whatever your parents may have told you —— there is a real Santa Claus. And I should know, because I've seen him myself! 不管你父母告诉过你什么——在我看来，圣诞老人真的存在。我当然知道，因为我曾亲眼见过。 Sorry I'm late. I might have turned off the alarm clock and gone back to sleep again. 对不起，我迟到了。可能我当时把闹钟按了之后又睡着了。（ might have turned off 显得辩解苍白而底气不足。） They might not have gone to the movies yesterday evening. The light was still on at their home then. 昨晚他们可能没有去看电影，因为当时他们家的灯亮着。 You may have met each other before. 或许你们以前已经见过面。 He may not have achieved all his aims. But his effort is praise worthy. 他可能没有达到他的全部目标，但他的努力值得赞扬。 She may/might have gone to the hospital. 她或许到医院去了。 The children may have gone to bed. 孩子们可能已经上床睡觉了。 They might not have settled the problem. 他们可能尚未解决那个问题。 2．can／could+have+过去分词 （ 1）“can／ could+have+ 过去分词”可译为“当时可能” ，表示对过去发生的动作或存在状态的推测，其可能性要强于“ may／ might+have+ 过去分词”，可用于否定句、疑问句和感叹句中。 can 一般不用于肯定句，肯定句中多用 could ，用于疑问句时 could 的可能性比 can 弱（李丙尧， 2002）。 试比较： I didn 't see her at the meeting this morning; she can 't／ couldn 't have spoken at the meeting. 今天上午我在会议上没有见到她，她不可能在会上发言。
一．To do形式 afford to do sth. 负担得起做某事 agree to do sth. 同意做某事 arrange to do sth.安排做某事 ask to do sth. 要求做某事 beg to do sth. 请求做某事 care to do sth. 想要做某事 choose to do sth. 决定做某事 decide to do sth. 决定做某事 demand to do sth. 要求做某事 expect to do sth. 期待做某事 fear to do sth. 害怕做某事 help to do sth. 帮助做某事 hope to do sth. 希望做某事 learn to do sth. 学习做某事 manage to do sth. 设法做某事 offer to do sth. 主动提出做某事 plan to do sth. 计划做某事 prepare to do sth. 准备做某事 pretend to do sth. 假装做某事 promise to do sth. 答应做某事 refuse to do sth. 拒绝做某事 want to do sth. 想要做某事 wish to do sth. 希望做某事 happen to do sth. 碰巧做某事 struggle to do sth. 努力做某事 advise sb. to do sth. 建议某人做某事allow sb. to do sth. 允许某人做某事 ask sb. to do sth.请（叫）某人做某事bear sb. to do sth.忍受某人做某事 beg sb. to do sth. 请求某人做某事cause sb. to do sth. 导致某人做某事command sb. to do sth. 命令某人做某事drive sb. to do sth .驱使某人做某事elect sb. to do sth. 选举某人做某事encourage sb. to do sth. 鼓励某人做某事expect sb. to do sth. 期望某人做某事forbid sb. to do sth. 禁止某人做某事force sb. to do sth. 强迫某人做某事 get sb. to do sth. 使（要）某人做某事hate sb. to do sth. 讨厌某人做某事 help sb. to do sth. 帮助某人做某事