初中英语不定式用法讲解

不定式用法讲解

不定式由“to十动词原形”构成，其否定形式是“not to do”．不定式可以带宾语或状语构成不定式短语，没有人称和数的变化，但有时态和语态的变化．不定式可作主语、宾语、状语、表语和定语，但不能单独作谓语．不定式的逻辑主语有时用“for十名词或代词宾格”构成．

1．不定式的用法：

l)作主语．不定式短语作主语时，往往放在谓语之后，用it作形式主语．例如：

To see is to believe．

It is right to give up smoking．

2)作宾语．不定式短语作宾语时，如果还带有宾语补足语。往往把不定式宾语放在宾语补足语之后，而用it作形式宾语．例如：He wanted to go．

I find it interesting to study work with him.

3)作宾语补足语．例如：

He asked me to do the work with him.

注意：在feel，hear，listen to，look at，notice, observe，see，watch，have, let，make等词后的补足语中，不定式不带to．但是这些句子如果变成被动结构时，就必须带to．例如

I often hear him sing the song．

He is often heard to sing the song．

注意：不定式动词在介词but，except，besides后面时，如果这些介词之前有行为动词do的各种形式，那么，这些介词后的不定式不带to，否则要带to．如：

She could do nothing but cry.

What do you like to do besides swim?

I have no choice but to go．

动词help之后，带to或不带to都可以。

Will you please help me (to) take this suitcase? 请你帮我提一下这个衣箱好吗？

She often helps her mother (to) clean their house. 她经常帮助她妈妈打扫房子。

4)作定语．例如：

I have some books for you to read．

注①作定语的不定式如果是不及物动词，或者不定式所修饰的名词或代词是不定式动作的地点、工具等，不定式后面须有相应的介词．例如：

He is looking for a room to live in．

There is nothing to worry about．

Please give me a knife to cut with．

但是，不定式所修饰的名词如果是time，place或way，不定式后面的介词习惯上要省去．例如：

He had no money and no place to live.

注②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，不定式既可以用主动语态，也可用被动语态，但其含义有所不同．试比较：

A) Have you anything to send? 你有什么东西要寄吗?

(不定式to send的动作执行者是you)

B) Have you anything to be sent? 你有什么要(我或别人)寄的东西吗?

(不定式to be sent的动作执行者是已被省略的me或someone else)

5)作状语，表示目的、原因、结果或条件．例如：

I came here to see you．(目的)

We were very excited to hear the news．(原因)

He hurried to the school to find nobody there．(结果)

so + adj. / adv. + as to do

such + adj. + n. +as to do…

adj. / adv.+ enough + to do

too + adv. / adj. +to do:太...而不能....;非常...

He was so foolish as to believe it.

= He was such a fool as to believe it.

= He was foolish enough to believe it.

The ice is too thin to skate on.

=The ice is not thick enough to skate on.

He was too happy(情感adj.) to see his father.

You can never too careful to cross the road.再...都不为过

To look at him, you would like him．(条件)

目的状语还可以用in order to或so as to来表示．如：

In order to pass the exam, he worked very hard．

We ran all the way so as not to be late．

不定式也可在作表语用的形容词后面作状语．例如：

I am very glad to hear it．

The question is difficult to answer．

“too十形容词或副词十不定式”作状语．例如：

He is too old to do that．

另外句子中有enough这个词时，常用不定式作状语．例如：The room is big enough to hold us．

6)作表语．例如：

My job is to help the patient．

7)作独立成分．例如：

To tell the truth，I don’t agree with you.

8)不定式与疑问词who，which，when，where，how，what等连用，在句中起名词作用，可充当主语、表语、宾语，宾补等．例如：He didn’t know what to say.(作宾语)

How to solve the problem is very important．(作主语)

My question is when to start. (作表语)

She often teaches me how to read and write.（作宾语补足语）她常教我如何读书写字。

注意：在与why连用时，只用于why或why not开头的简短疑问句中，后面紧跟的动词不定式不带to. 例如:

Why not have a rest?

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动词不定式用法及练习题-L105

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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）

(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

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动词不定式用法 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, practise, 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.

初中英语动词不定式的基本用法(2)(最新整理)

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