to do sth不定式用法

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 dangerous 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

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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

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初中不定式todo的用法

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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, Iearm，宁可假装知道(prefer, pretend, know)，希望想要愿意(wish, want, would like / love)。女口： 1) We decided to talk to SOme StudentS about Why they go there. 2) He PreferS to eat White bread and rice. 3) Id love to ViSit Mexico. 2. 动词decide, know, 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。女口： 1) Could you PIeaSe tell me Where to Park my car? 2) It gives advice on What to do in lots of different SitUations. 3. 动词feel, 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...。女口: 4. 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

动词不定式的基本用法

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

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.

第1讲非谓语动词：不定式(todo)的用法

非谓语动词不定式 非谓语动词——不定式不定式的2种形式 不定式在句子中的成分 say is easy and is hard. 主语主语To say is easy and is hard. To see is to believe. 主语

’s +adj. for sb. to do sth. 形式主语真正主语该类形容词有： difficult/hard/important/possible/ adj. 修饰sth. j dj f b h 形式主语真正主语impossible/comfortable/necessary 等该类形容词有：adj. 修饰sb. ’s +adj. of sb. to do sth.类形容有 kind/nice/stupid/rude/clever/foolish/thoughtful/brave/considerate 等 It ’s interesting It ’s kind of you to help To see is to believe 表语 To see is to believe . 对于一个老师来说最重要的事 The most important thing for a 是公平地对待每个学生.The most important thing for a teacher is to treat every student equally. 三. 作宾语 The bird wants to find something to drink. 宾语 +不定式作宾语的动词有：三个希望两答应：hope, wish, want, agree, promise 两个要求未拒绝：设法学会做决定：不需假装在选择p ,,,g ,p demand, ask, fail, refuse manage, intend, learn, decide, determine 不需假装在选择： desire, pretend, choose But the bird found it hard to find water. 主语+find/think +it + adj. + to do sth. 形式宾语 真正宾语 j 宾补 exercises. 主谓关系 advise, allow, ask, wish ll h want, get, order, tell, teach

动词不定式用法及练习题-L105

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,

(完整版)省略to的动词不定式用法归纳

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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）

to-do-sth不定式用法

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.

(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

动词不定式用法

动词不定式用法 不定式是动词的一种非限定式，它是不受主语的单复数、人称、时态、语态等的限定及影响的一种动词形式。 一、动词不定式的基本结构 动词不定式的基本形式为：to+动词原形，有时可不带to。不定式的否定形式是：not to+动词原形。在句中除不能作谓语外，其他成分都可作。如：主语、表语、宾语、宾语补足语、定语和状语等。 注意：不定式之前的to（又称为小品词）与介词to的功能不同。介词to之后要接名词或代词的宾格，或相当于名词的短语作它的宾语；而不定式符号to的后面需要跟动词原形。 speak to him (to 是介词) 对他讲话 to speak English (to 是不定式的小品词) 讲英语 二、动词不定式的用法 不定式在句中有各种作用，一般可归类为三种基本用法：作名词，作形容词，作副词。 (一) 不定式作名词的用法 不定式起名词作用，在句子中担当主语、表语、宾语和宾语补足语。 ⒈作主语

名词用法的不定式和名词一样，可担任句子的主语。 To grow more trees here is very important. (=It is very important to grow more trees here.) 在这里多种些树是非常重要的。 To hear your voice is so nice. (=It is so nice to hear your voice.) 听到你的声音真高兴。 To speak English well is not easy for me. (=It is not easy for me to speak English.) 把英语说好对我来说并不容易。 To walk to school takes me twenty minutes. (=It takes me twenty minutes to walk to school.) 步行到学校我要花20分钟。 注意：在It is… to…‖的句型中，it是形式主语，真正的主语是不定式；使用这种结构，可以避免句子的头重脚轻。通常不定式被视为第三人称单数，所以动词用is或was。 It is bad for your eyes to read in the sun. 在阳光下看书对你的眼睛有害。 另外，不定式作主语的句子，同时有另外一个不定式作表语时，不能转换成―It is… to…‖的句型。 To see is to believe. (百闻不如一见。) 不能转换为：It is to believe to see. 2.作表语