初中英语动词不定式复习ppt课件

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7.疑问词who, what, which, where, when, how 加to do可构成不定式短语，在句中可用作主语、 宾语、宾语补足语、表语等。
When to start has not been decided. (主语) I don't know how to use a computer. (宾语) I don’t know what to do. (宾语) He can tell you where to get the book. (宾补) The question is who(m) to ask. (表语)
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（不定式作主语时可将其用形式主语it来替换） 1. To go abroad is his dream. It is his dream to go abroad.
2. To say is easy, to do is difficult. It is easy to say, it is difficult to do.
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4、感官动词: see, watch, look at, hear, listen to, smell, feel, find 等后作宾补，省to。 如：I saw him dance. 我看见他跳舞。 （其中help的to可省可不省） e.g: Let me do it. e.g: I saw him cross the street. 比较：
比较： I heard her singing in the next room. I heard her sing in the next room.
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3. 用作状语(adverbial)：
He came to show me his new CD player.
I went there to see my teacher. She came back to get her English book. The boy was too frightened to move.
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5.用作表语
His work is to feed the animals. Her job is to look after the patients. My dream is to be a scientist.
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6.用作定语
（这时不定式与被修饰词有动宾关系。
若是不及物动词，介词不能省略）
wish sb to do order sb to do
like sb to do help sb to do
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宾语补足语不带to 的情况：
let
一感:feel
三让 make
have
listen to
二听
hear
四看
watch see look at
notice
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Let me do it. I saw him cross the street.
Give me something to drink.
I have two books to read.
They have much food to eat. He asked for a room to live in. I don’t have a pen to write with.
The ice is hard enough to skate on. He bought a toy to play with.
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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。
Why not have a rest?
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特殊用法
too...to 太 ... 以致于不能... enough to 足以... The box is too heavy for me to lift. 这个箱子太沉了，我提不动。 He is old enough to go to school. 他到上学的年龄了。
Revision
The infinitive
动词不定式
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定义：不定式的构成是to+动词原形，当然to有 时也可以省略。动词不定式没有人称和数的变 化，可以担当除谓语外的任何句子成分。
构成：to + do(动词原形)
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用法：1、用作宾语 (v. + to do )
e.g: I want to buy a computer. She hopes to find a better job. I wish to go with you. I found it difficult to fall asleep.我发现很难入睡。
(目的)
(目的) (目的)
（结果）
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4.用作主语
It与不定式：动词不定式可以做主语，但如果 动词不定式太长，显得头重脚轻的，那么我们 就可用形式主语it代替，而把真正主语(即不定 式)放于句尾。 e.g: It is not difficult for me to study English well. 对我来说学好英语不难。
need to do learn to do agree to do stop to do plan to do decide to do go on to do try to do begin to do start to do refuse to do like to do forget to do remember to do
14Biblioteka 不定式省to有四种情况：宁愿；宁可
1、would rather，had better后。
e g: You had better stay at home. 2、Why... / Why not...后。 e.g：Why not have a good rest on Sunday? 为 什么星期天不好好休息一下呢? 3、使役动词 let, have, make 等后接不定 e.g: Let him go! 让他走!
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2. 用作宾语补足语：(v. + sb. + to do )
She asked me to help her. The teacher told him to come on time. Edison’s mother taught him to read and write.
want sb to do get sb to do find sb to be would like sb to do