文档介绍：不定式由“to+动词原形”构成,其否定形式是“not/never 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。不定式可以作主语、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+名词或代词宾格”构成。
不定式
Unit1《Living_well》grammar选修7
2021/1/11
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结构 : to do
(否定) not/never to do
二. 时态与语态
主动语态
被动语态
一般式
进行式
完成式
完成进行式
不定式
to do
to be done
to be doing
to have done
to have been
done
to have been
doing
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Unit1《Living_well》grammar选修7
2021/1/11
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(1).They pretended not to see us.
(2). He pretended to be sleeping.
(3).She pretended to have known it before.
(一般式表示与谓语的动作同时/几乎/发生在
它之后.)
(在谓语动词发生的同时,不定式的动作也正在进行)
(完成式表示动作发生在谓语动作之前)
(4).We’re happy to have been working with
you.
(完成进行式表示谓语动作发生之前,不定式的
动作一直在进行而且可能之后也继续)
Unit1《Living_well》grammar选修7
2021/1/11
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1. 作主语
2. 作宾语
3. 作宾语补足语
4. 作定语
5. 作状语
6. 作表语
7. 作独立成分
8. 与疑问词等连用
Unit1《Living_well》grammar选修7
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三. 用法/ 功能
To see is to believe.
It’s important to learn English well .
(1). 主语
单个不定式作主语时,谓语动词用单数
若不定式太长,往往用it作形式主语,不定式置后.
My job to help the patient.
Your task to clean the classroom.
is
is
(2). 表语
Unit1《Living_well》grammar选修7
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I want to go home.
The workers demanded to get better pay.
I found it necessary to talk to him again.
(3) 宾语
think/ consider/ find it + adj.+ to do
常用动词不定式作宾语的动词有：
hope, refuse, learn, set out
choose, decide, agree, manage,
pretend, plan.
Unit1《Living_well》grammar选修7
2021/1/11
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The teacher told me to clean the blackboard.
I expect you to give me some help.
(4). 宾补
五看
watch
see
look at
observe
notice
三使
let
make
have
二听
listen to
hear
一感觉:
feel
warn, tell, allow, help, ask, force等
Unit1《Living_well》grammar选修7
2021/1/11
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. I made him do his work.
He was made to do his work (by me).
注意
1> help 后面的“to”可省去
. They often help the grandma (to)
carry water.
2> see, hear, watch, feel, notice, look at等表示
感觉和let, make, have等表示使役的动词后
面，不定式作宾语时要省“to” （注：被动
语态