(完整版)高中动词不定式用法讲解和练习

Grammar Presentation---动词不定式

一、不定式的句法功能

●不定式作主语

?To learn a foreign language is not easy.学习外语不是一件容易的事。

◎不定式短语作主语时，常用it作形式主语来代替它的位置，而将真正的主语（不定式短语）移到谓语之后

?It’s a great honor to be invited to Mary’s birthday party.很荣幸被邀请参加玛丽的生日聚会。

●不定式作宾语

◎作动词宾语

◇下列动词常接不定式作宾语，如：agree, arrange, ask, beg, choose, dare, decide, demand,expect, fail, fear, hope, manage, offer, plan, prepare, pretend, promise, ?They hope to find new resources for mankind.他们希望为人类找到新资源。

◇如果不定式作宾语且有自己的补语，常用“it”作形式宾语，而把真正的宾语放在后面。

下列动词常用it作形式宾语，如：believe, consider, feel, find, know, make ?I know it impossible to finish so much homework in one day.

我知道在一天中完成这么多的作业是不可能的。

●不定式作表语

◎不定式作表语时，一般紧跟在系动词后，说明主语的内容

?The first step is to check the victim’s breathing.

第一步是检查受害人的呼吸。

●不定式作补语

?I’d like the problem to be discussed at the next meeting.我希望这个问题在下一次会上讨论。

●不定式作定语

?The students have a lot of homework to do every day.学生们每天都有很多家庭作业要做。

●不定式作状语

不定式可以作原因状语、结果状语、目的状语以及方式状语

不定式在下列句式中作目的状语：so as to do, in order to do

?In order to ensure your hair looks its best, pay attention to what you eat.

为了保证你的头发是最佳状态，请注意你的饮食。

二：不定式考点归纳：

考点1：不定式的时态和语态：

1.---Is Bob still performing?

---I’m afraid not. He is said ____the stage already as he has become an official.

A. to have left

B. to leave

C. to have been left

D. to be left

2.The news reporters hurried to the airport, only ____ the film stars had left.

A. to tell

B. to be told

C. telling

D. told

1．A. 根据句子的意思“据说他已经离开了舞台”，要用不定式的完成式的主动形式。2．B. 用动词的不定式的被动形式表示结果状语。

考点2：不定式的功能：不定式具有名词的特征，可以作主语或宾语（例5），具有形容词的

特征，可以作表语、定语或补足语（例4）；具有副词的特征，在句子中可以作状语（例3）。

3.It was unbelievable that the fans waited outside the gym for three hours just ____ a look at the

sports stars.（2005 上海卷）

A. had

B. having

C. to have

D. have

4.I don’t want _____ like I’m speaking ill of anybody, but the manager’s plan is unfair.

A. to sound

B. to be sounded

C. sounding

D. to have sounded

5.In fact ____ is a hard job for the police to keep order in an important football match.

A. this

B. that

C. there

D. it

3．C.本题考查不定式作目的状语。“体育球迷们等在体育场外三个小时，目的仅仅是为了看一眼这些体育明星”。

4．A. want后面要选用不定式形式，sound是连系动词，不能用被动语态。

5．D.句子的真正主语是不定式短语to keep order in an important football match形式主语。

考点3：不定式的省略：分为两种：一种是不定式符号“”后面省略实义动词的形式（见考例6）；另一种则是对不定式符号“”的省略（见例7）。

6.The boy wanted to ride his bicycle in the street but his mother told him_______.(NMET2005)

A. not to

B. not to do

C. not do it

D. do not

7.Paul doesn’t have to be made ____. He always works hard. (NMET2005)

A. learn

B. to learn

C. learned

D. learning

6．A. tell sb. to do sth. 的意思是“告诉某人做某事”，其否定形式是在to前面加not。英语中，为了避免重复，常用省略形式，因此这个句子省略了do it。选项B如果加上it，也是正确的。

7、B．make, let, have, hear, see, feel, watch, notice等动词，后面接不定式作宾补语时，常省略不定式to。但是，当这类动词用于被动结构作主语补足语时，动词不定式必须带to。

考点4：不定式的否定形式

动词不定式的否定形式是在不定式符号“”前面直接加上，有进为了强调也可以用否定词来否定（见考例8、9）

8.The purpose of new technologies is to make life easier, _____ it more difficult.(NMET1999)

A. not make

B. not to make

C. not making

D. do not make

9.The teacher asked us ____ so much noise.(2003北京卷)

A. don’t make

B. not make

C. not making

D. not to make

8、B．动词不定式to make life easier和not to make it more difficult都作is的表语。做这类题目时，要比较非谓语动词的形式，前后要保持一致，后面不能省略to。

9、D．本题考查动词不定式的否定形式作宾语，句子的意思为：老师叫我们不要制造很大的噪音。

考点5：不定式的搭配形式：不定式常常独立存在的，如果强调其所表动作的时间、地点、内容、方式等时，可出现“疑问+不定式”的结构；强调动词不定式所表动作的使用工具、范围等时应使用“不定式+介词”的结构（见考例10）。

10.It is said in Australia there is more land than the government knows______.（NMET2002）

A. it what to do with

B. What to do it with

C. what to do with it

D. to do what with it

10、本题考查“疑问+不定式”和动词作短语do with的用法。根据本题的句意可以看出，由于know不可以直接跟动词不定式而排除D；“疑问+不定式”结构当然要把疑问词置于前面，从而排除A；what…do with…实际上是一个常用的短语，在短词中what作do的宾语，句中的it作介词with的宾语，故选C。

Focused Practice (1)---不定式

Ⅰ．基础巩固用动词的适当形式填空

1．While she lived, her front gate was always locked and no one ever saw her (leave) or saw anybody (go) in.

2.The thieves happened (quarrel) about the treasures when the police went in.

3.It is not difficult (learn) a foreign language if you spend time and effort on it.

4.He was ever so happy (admit) to the army.

5. The student pretended (study) hard when his mother came in.

6.Charles Babbage is generally considered (invent) the first computer.

7.The magazines are not allowed (take) out of the reading room.

8.Would you like (go) with me or would you rather (stay) at home ?

9.My work is (clean) the room every day.

10.She lets her children (play) in the street.

Ⅱ.运用提高根据汉语提示完成下列句子。

1．我把做最后决定的事交给你了。

I will leave it to you .

2.我昨天听见她在隔壁唱过一首歌。

I heard her in the next room yesterday.

3.有人看见她胳膊下夹着一本书走进教室。

She was seen with a book under her arm.

4.我会认为他是一个诚实的人。

I will consider him .

5.问题一提出，他第一个举起手。

When the question was out, he was the first one .

6.他没有及时意识到问题重要性。

He was the last of this problem.

7.他是个很难对付的老师。

He is a tough teacher .

8.恐怕我不能参加你的晚会了，因为我有很多事情要做。

I am afrai d l can’t attend your party, for l have .

9.我碰巧知道你那个问题的答案。

I happen to your question .

10.他不给他们任何东西，这显得太自私了。

It seemed selfish of him anything .

Keys:

I. 1.leave; go 2. to be quarreling 3. to learn 4. to have been admitted 5.to be studying

6. to have invented

7.to be taken

8.to go; stay

9. to clean 10.play

II. 1.to make the final decision 2. sing a song 3.to walk into the classroom

4.to be an honest man

5. to raise his hand

6. to realize the importance

7.to deal with 8.too many things to do 9.to know the answer 10.not to give them

Home Assignment

（）1.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

（）2.—l usually go there by train.

.—Why not by boat for a change ?

A. to try going

B. trying to go

C. to try and go

D. try going

（）3.Paul doesn’t have to be made He al— ways works hard.

A. learn

B. to learn

C. learned

D. learning

（）4.Tell him the window.

A. to shut not

B. not to shut

C. to not shut

D. not shut

（）5.She pretended me when l passed by.

A. not to see

B. not seeing

C. to not see

D. having not seen

（）6.Mrs. Smith warned her daughter after drinking.

A. never to drive

B. to never drive

C. never driving

D. never drive

（）7.The boy wanted to ride his bicycle in the street, but his mother told him .

A . not to B. .not to do

C. .not do it

D. do not to

（）8.The patient was warned oily food after the operation.

A .to eat no B. eating not

C. not to eat

D. not eating

（）9. — The light in the office is still on.

— Oh, l forgot .

A. turning it off

B. turn it off

C. to turn it off

D. having turned it off

（）10. She reached the top of the hill and stopped on a big rock by the side of the path.

A. to have rested

B. resting

C. to rest

D. rest

Keys:

1-5 B D B B A 6-10 A A C C C

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非谓语动词 一、英语句子需要遵循一个总原则：一个句子只能有一个动词。当一个句子必须要出现两个或两个以上的动词才能完整 表达一个意思时，为了不违法总原则，英语有四种处理方式： 1. 切分成两个或者多个句子 She is a girl. She likes English 2. 将一个谓语动词做主句，其余动词改成从句 She is the girl who likes singing. 3. 添加and, but, or, when, because, not only..but also, either..or 等连词变成并列结构 She got off the bus, but left her handbag on her seat. 4. 将其中一个动词变成非谓语动词形式 She got off the bus, leaving her handbag on her seat. 二、非谓语动词使用条件：一个句子当中，已经存在一个主句（谓语动词），又没有连词(and,but,or等)的情况下， 还有别的动词出现时，这时就要用非谓语动词 三、非谓语除了不能做谓语外，其他成分都可以做 不定式（to do） 四、非谓语动词三种形式分词现在分词（doing） 过去分词( done ) 动名词(doing) 五、非谓语动词解题技巧： 1. 判断是不是用非谓语动词（1.看有没有逗号 2.看有没有谓语 3.看有没有连词。要牢记英语中逗号不能连接两个 句子，一个句子如果没有连词只能有一个谓语） 2. 判断是主语和动词是主动还是被动关系 3. 判断时间, 确定非谓语动词和主句动词谁先发生，谁后发生 不定式的用法 不定式构成一般式完成式进行式 主动关系to do to have done to be doing 被动关系to be done to have been done 不定式动词和谓语动词发生的时间关系不定式的动作和谓语动作同时发生， 或发生谓语动作之后 he seems to know a lot 不定式的动作发生在谓语动 作之前 I regretted to have told you a lie. 不定式的动作和谓语 动作同时发生 I’m glad to be talking with you 不定式否定形式在to前加not. 即not to..... 不定式充当的成分主语，宾语，表语，定语，状语，宾补

(完整word版)动词不定式的用法讲解及练习题北京四中

北京四中 撰稿老师：黄浩编审老师：蔡正礼责任编辑：丁华 动词不定式的用法讲解及练习题 不定式既具有动词的一些特征，又具有名词，形容词和副词的句法功能 否定式：not +不定式 不定式的时态 一般说来，不定式一般式表示的动作有时与限定动词表示的动作同时发生，也有时发生在限定动词表示的动作之后。如： Who heard him say that? He seems to know this. I hope to see you again. 不定式进行式表示动作正在进行，通常与限定动词表示的动作同时发生，如： They are said to be building another bridge across the river. I happened to be going that way too. 不定式完成式表示的动作发生在限定动词表示的动作之前，如： I am sorry to have given you so much trouble. I am glad to have seen your mother. 不定式的句法功能： （1）作主语 To talk with him is a great pleasure. 不定式短语作主语时，为了保持句子的平衡，往往以it作形式主语，而把不定式短语置于谓语动词之后，如： It's nice to hear your voice. （2）作表语

Her wish is to become an artist. （3）作宾语 常用于及物动词: want , hope, wish, like, need, hate, offer, prefer, begin, start, attempt, decide, determine, expect, promise, pretend, refuse ,afford, manage, help等之后，如： You should continue to learn as long as you live. 注1：如果作宾语的不定式又有自己的补语，则须用先行词it 作形式宾语，而将真正的宾语不定式后置，如： They found it impossible to get everything ready in time. 注2：不定式一般不能作介词的宾语，只有在极少数介词如:but, except等后边才行。此时不定式可以带to或不带to,如： In very cold winter weather a cold-blooded animal has no choice but to lie down and sleep. There was nothing left to do but clean the windows.(前边有do, to 省略) 但“疑问词+不定式”结构可以作介词的宾语，如： I have no idea about what to do next. （4）作宾语补足语 通常用于及物动词或动词短语：want ,wish, ask, order, beg, tell, permit, know, help, advise, persuade, allow, prepare, cause, force, require, call on, wait for 等之后，如： The teacher asked the students to hand in their homework. （5）作定语 不定式作定语时，须放在被它修饰的名词或代词之后。被修饰的名词或代词往往是不定式的逻辑宾语。 I have a lot of work to do. 当作定语的不定式所修饰的名词或代词是不定式动作的承受者时，不定式既可用主动语态，又可用被动语态，但其含义有所不同。所以如果修饰名词的不定式的动作是主语作的, 不定式用主动。

动词不定式用法讲解

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 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： 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? 明天和我们一起去野餐好吗？

高中英语动词不定式用法大全

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

高中动词不定式用法讲解及练习

Grammar Presentation---动词不定式 一、不定式的句法功能 ●不定式作主语 ?To learn a foreign language is not easy.学习外语不是一件容易的事。 ◎不定式短语作主语时，常用it作形式主语来代替它的位置，而将真正的主语（不定式短语）移到谓语之后 ?It’s a great honor to be invited to Mary’s birthday party.很荣幸被邀请参加玛丽的生日聚会。 ●不定式作宾语 ◎作动词宾语 ◇下列动词常接不定式作宾语，如：agree, arrange, ask, beg, choose, dare, decide, demand,expect, fail, fear, hope, manage, offer, plan, prepare, pretend, promise, ?They hope to find new resources for mankind.他们希望为人类找到新资源。 ◇如果不定式作宾语且有自己的补语，常用“it”作形式宾语，而把真正的宾语放在后面。 下列动词常用it作形式宾语，如：believe, consider, feel, find, know, make ?I know it impossible to finish so much homework in one day. 我知道在一天中完成这么多的作业是不可能的。 ●不定式作表语 ◎不定式作表语时，一般紧跟在系动词后，说明主语的内容 ?The first step is to check the victim’s breathing. 第一步是检查受害人的呼吸。 ●不定式作补语 ?I’d like the problem to be discussed at the next meeting.我希望这个问题在下一次会上讨论。 ●不定式作定语 ?The students have a lot of homework to do every day.学生们每天都有很多家庭作业要做。 ●不定式作状语 不定式可以作原因状语、结果状语、目的状语以及方式状语 不定式在下列句式中作目的状语：so as to do, in order to do ?In order to ensure your hair looks its best, pay attention to what you eat. 为了保证你的头发是最佳状态，请注意你的饮食。 二：不定式考点归纳： 考点1：不定式的时态和语态： 1.---Is Bob still performing? ---I’m afraid not. He is said ____the stage already as he has become an official. A. to have left B. to leave C. to have been left D. to be left 2.The news reporters hurried to the airport, only ____ the film stars had left. A. to tell B. to be told C. telling D. told 1．A. 根据句子的意思“据说他已经离开了舞台”，要用不定式的完成式的主动形式。2．B. 用动词的不定式的被动形式表示结果状语。 考点2：不定式的功能：不定式具有名词的特征，可以作主语或宾语（例5），具有形容词的特征，可以作表语、定语或补足语（例4）；具有副词的特征，在句子中可以作状语（例3）。

非谓语动词之动词不定式(todo)的用法

非谓语动词之动词不定式（to do）的用法 非谓语动词是指在句子中不是谓语的动词，主要形式有：不定式、动名词和分词（现在分词和过去分词）。 “to do”动词不定式的变形 动词不定式的用法 充当主语（一般会用it 当形式主语） To swim here is dangerous. = It is dangerous to swim here. To pass this English exam is unlikely. = 充当表语（多数情况下，可以转换成动词不定式做主语） My job is to help with your English learning. To help with your English learning is my job. 充当宾语（只能做某些动词的宾语，一般不做介词的宾语；有时用“it”做形式宾语） I decided to attend this meeting last night. I find it necessary to learn a foreign language. 注意：当以下动词欲接动词作宾语时，只能跟不定式作宾语。 decide, determine, learn, wish, hope agree, plan, pretend, dare, refuse, fail prepare, try, manage, help, promise offer, beg, demand, afford, arrange, be supposed

充当宾语补足语 I persuaded him to make a speech in public. 注意：在感官动词／使役动词／help后（see, hear, watch, notice, make, have, let后不定式做宾补时，可省略“to”） I saw them have a disagreement on who should sweep the floor. （我看到了他们争论的整个过程） 但，感官动词后面也可接Ving形式，表示正在进行。 I saw them arguing about who should sweep the floor. （我看到他们正在争论谁该扫地，并不一定看到了整个过程） 充当状语（目的，原因，结果状语，其逻辑主语与句子主语一致） I wrote him a letter to further explain this matter. （目的状语） I’m sorry to bother you.（原因状语） He queued for hours at the box office only to find that the show was sold out. （结果状语，only + to find/realize/discover表示出乎意料的结果） 充当定语（不定式作定语，要放在所修饰的词的后面） I have a lot of dishes to wash. Do you have anything to say There are 3 questions to answer. 一些固定句型中不定式省略“to” had better would rather do… than do… why not do “except/but” 有“do” 无“to”，有”to”无“do” have nothing to do but do… do everything but/except have no choice but to want nothing but/except to 当两个或多个作用相同的不定式并列（and/or/than）时，通常只保留第一个不定式的“to”. He told me to stay there and wait for him. It’s easier to persuade people than force them. To try and fail is better than not to try at all. （否定式中“to”不能省略）

动词不定式用法大全

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

(完整版)动词不定式的用法总结

动词不定式的用法总结 动词不定式在中学英语中应用非常广泛，一方面在句中可起名词、形容词或副词的作用，同时也可在句中作主语、宾语、定语、状语和宾语补足语。接下来为大家提供了以下：动词不定式的用法总结一 动词不定式的形式一般是to +动词原形，但to有时要省去。 而动词不定式在具体运用时用不用to，取决于谓语动词的用法。 现就以下几方面介绍如下。 一、不定式结构 1. 带to的不定式结构 能直接跟带to的不定式结构的动词主要有：want, ask, tell, hope, learn, try, decide, forget, remember, like, love, stop, go, come等。 如： I want to go to the movies with you. 我想跟你一起去看电影。 Don’t forget to turn off the light before you leave. 在你离开之前别忘了关灯。 注意：动词不定式的否定形式是在不定式前直接加not，即not to do sth.。

如： Dave told me not to wake up Kate. 大卫告诉我别叫醒凯特。 2. 不带to的不定式结构 以下几种情况使用不带to的动词不定式： (1)在固定词组had better之后。 注意：had better的否定形式是had better not do sth.。 如： You had better go home now. 你最好现在回家。 It’s cold outside. You’d better not go out. 外面很冷，你最好不要出去。 (2)在let, make, see, feel, watch, hear等感官或使役动词后，要跟不带to的动词不定式作宾语补足语。 如： I made them give me the money back. 我迫使他们把钱还给我。 I didn’t see you come in. 我没看见你进来。 (3)在引导疑问句的why not之后。 Why not+不带to的不定式是Why don’t you do的省

动词不定式(基础讲解)

动词不定式 【概念引入】 1. 动词不定式名言： （1）动词不定式作表语 To lose is to learn. 失败就是学习。 （2）动词不定式作主语 It is better to give than to take. 给予比接受更好。 （3）不定式作宾语 Expect to be treated as you have treated others. 你怎样待别人，就指望别人怎样待你。 （4）不定式作宾补 Adversity causes some men to break，others to break records. 逆境使一些人崩溃，也使一些人破记录。 （5）不定式作定语 There is a time to talk and a time to act. 该说的时候说，该做的时候做。 （6）不定式作目的状语 To find the exact answer，one must first ask the exact question. 要找到确切的答案，首先必须提出确切的问题。 2. 动词不定式定义： 动词不定式是一种非谓语形式（不能作谓语），基本形式是to do形式(to是不定式符号的标志，无意义，可以不翻译) 肯定式：to + 动词原形 否定式：not to + 动词原形 【用法讲解】 1.动词不定式的特征 动词不定动式是一种非谓语动词形式，它没有人称和数的变化，在句子中不能作谓语，但可以作除谓语之外的其它任何句子成分（主语、表语、宾语、宾语补足语、定语和状语）；动词不定式具有名词、形容词和副词的特征，同时还保持动词的某些特点，既可以有自己的宾语和状语，动词不定式和它的宾语和状语构成不定式短语。 2. 动词不定式在句子中的作用 动词不定式是由to+动词原形构成，在句中起名词，形容词和副词的作用，可以担任除谓语以外的其它任何成分。 （1）动词不定式作主语。例如： To master a language is not an easy thing. 掌握一门语言不是一件容易的事情。 To teach English is my favorite. 教英语是我的爱好。 It's my pleasure to help you. 很乐意帮助你。 （2）动词不定式作宾语。 某些及物动词可以用动词不定式作宾语，这些动词有decide, begin, help, want, wish, like, forget, learn, ask等。例如： I like to help others if I can. 如果有可能的话，我喜欢帮助别人。 I want to buy a new car when I have enough money. 我有钱时想买一辆新车。