文档介绍：动词不定式
动词不定式属于非谓语动词的一种形式,区别于谓语动词。
一、动词不定式在句子中不能充当谓语，没有人称和数的变化。 二、动词不定式是由“to+动词原形”构成(有时可以不带to)。
动词不定式的否定形式是“not+动词不定式” 。
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动词不定式
To do that sort of thing is foolish。
I want to see you this evening.
All you have to do is to finish it quickly.
We found a house to live in.
She came here to study English.
I warned the patient not to eat cold water after the operation.
主语
宾语
表语
定语
状语
宾补
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作主语
To master a foreign language is really important nowadays.
To give up smoking is right.
。
2. 放弃吸烟是对的。
It is important to master a foreign language.
It is right to give up smoking
for us
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To do 作主语， 常用it 作形式主语，to do真正的主语放在句末。
It is adj. for sb to do sth
(necessary/ important/ easy/ difficult/ possible)
如形容词是用来形容人 ，则介词用of
It is adj. of sb to do sth
(kind, good, nice, foolish, clever, silly wrong, stupid, considerate, rude, impolite)
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作宾语
Fred didn’t have any money, so he decided to look for a job.
He promised not to tell anyone about it.
1. Fred 没有钱，所以他决定找一份工作。
2. 他答应不告述任何人这事。
一. 通常要用动词不定式做宾语的动词有:wish ， hope ， prepare, manage ， ask ， offer ， promise ， expect, pretend ， decide, intend等。
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二. 有时可以用 it 作形式宾语，而把真正作宾语的动词不定式放在后面。
It is + adj. (of / for sb) to do sth
例如： I find it hard to persuade her.
常用动词： make, find, feel, think, believe, consider
He made it a rule to read English every day.
I find it hard for me to master a foreign language.
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三. 有些动词后面既可以接不定式作宾语,又接动名词作宾语,但意义不同。如remember, forget, stop, try, regret, mean 等。
例如：
I remember locking the door.
（ lock 动作已经发生）
Please remember to lock the door when you leave.
（ lock 动作还没有发生）
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作表语
My job is to teach English.
To see is to believe.
1. 我的工作是教英语。
2. 眼见为实。
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作定语
a. 动词不定式可以用在名词后面作定语。
如：I have many letters to answer.
b. 但如果动词不定式的动词为不及物动词时，要在其后面加上适当的介词。
如：She has only a cold room to live in.
c.