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不定式是动词的一种非限定形式,由 “ to+动词原形” 构成,没有人称和数的变化,、形容词和副词的特征，在句中可以作主语、宾语、宾语补足语、表语、定语、状语等。
辨别下面不定式在句子中充当的成分:
It is good to help others.
It is my ambition to make sure that the disabled people in our neighborhood have access to all public buildings.
My ambition is to work in the computer industry when I grow up.
1
(subject)
2
(subject)
3
(predicative)
4
(attribute)
(attribute)
(object)
(object)
4. I don’t have time to sit around feeling sorry for myself.
5. I am the only student in my class to have a pet snake.
6. A big company has decided to buy it from me.
7. My fellow students have begun to accept me for who I am.
(adverbial)
(adverbial)
(object complement)
8. I have had to work hard to live a normal life.
9. Some days I am too tired to get out of bed.
10. We must call on local government to give financial assistance to disabled people.
不定式在句中的功能
#2022
做宾语
她喜欢谈论这件事情。
Ex. She loves to talk about the matter.
他希望不久能找到工作.
He hopes to find a job soon.
常接不定式做宾语的动词有：afford, agree, aim, arrange, ask, attempt, begin, bother, care, choose, continue, dare, decide, demand, expect, fail, hate, hope, learn, long, manage, mean, need, offer, plan, prefer, prepare, promise, prove, refuse, want, wish等
Ex. Do you remember which way to get there?
<1>.不定式有时和连接代/副词一起构成宾语.
01
Have you decided what to do next?
下一步干什么你决定了吗?
02
I didn’t know whether to laugh or cry about it.
<2>有时不定式由whether引起.
04
I’ll ask him how to operate the machine.
我来问他怎么样开这机器.
03
feel, find, judge, make, think, believe, consider 等动词后如果是不定式做宾语,补语是形容词(间或是名词),常用it作形式宾语,把不定式后移.
Ex. I find it difficult to work with him.
Ex. Father will not allow us to play on the street.
My brother asked me to clean the room with him.
:
常带to的不定式做宾语补足语的动词有: ask, beg, prefer, help, promise, wish, want, expect, permit, request, allow, command, tell ,invite, cause, encourage, warn, advise, persuade, force, order, remind, teach, 等.