不定式

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不定式作主语
It's necessary to complete the design before National Day
作宾语
I want to go at once.
可以接不定式短语的这类动词
like want try wish begin decide ask forget
promise hope love affer refuse

不定式: 除了固定用法外,"将来"、"主动"、"目的"
不定式具有名词、形容词、或副词的某些语法,又有动词的失态和语态
1、有些及物动词用不定式作宾语,结构动词+不定式
afford,aim,agree,arrange,ask,decide
The driver failded to see the other car in time.
He offered to help me.
动词除了可以用不定式作宾语,还用不定式作补语,动词+宾语+不定式
ask,choose,expect,help,beg,intend
I like to keep everything tidy
I want to speak to Tom.
有些动词或动词词组可以用动词+疑问词+不定式的结构做宾语
decide,know,consider,forget,learn,remember
Please show us how to do that
省去to的动词不定式
1 情态动词
2 使役动词 let have make 后,感官动词 see watch look at, notice ,observe,hear,listen to ,smell
feel,find
I saw him dance 我看见他跳舞 == He was seen to dance
The boss made them work the whole night. 老板让他们整夜的干活
=They were made to work the whole night.
3 would rather,had better 句型
4 Why.../why not
5 help 可以带to,也可以不带to
6 but,except后, but前是实义动词,后面出现的不定式不带to
He wants to do nothing but go out.
He wants to do nothing but to take the medicine.
7 and / or / than连接两个不定式,第二个to可以省掉
8 discover imagine suppose think 等作宾补时,可以省去to be
He is supposed (to be) nice.

 

 

 

 

非谓语动词(不定式)讲解及练习

The Minister of Finance is believed __B__ of imposing new taxes to raise extra revenue.
A.that he is thinking   
B.to be thinking
C.that he is to think  
D.to think


非谓语动词的用法和区别
1、不定式:具有n. adj. adv.特征,在句子中担任除谓语外任何成分
2、动名词:具有n. 特征,在句子中可作主语、宾语、定语、表语
3 分词: 具有adj. adv. 特征,在句子中可作为主语、宾语、状语
to do(not to do) 一般式
to be doing 进行式
to have done 完成式
to have been doing 完成进行式
to be done 一般式
to have been done 完成式
1 I'm glad to see you.同时发生
2 They invited us to come to a party(不定式动作后发生)
3 The computer to be produced is of a new type(被动)
4 You must promise never to do that again.
*进行式:谓语动词表示的动作发生时,不定式表示的动作正在进行
1 They are said to be building another bridge over the river.
 据说他们正在这条河上修另一座大桥
2 I'd rather read than watch television ; the program seem to be getting worse all the time.
*完成式:不定式表示的动作发生在谓语动词表示的动作之前
1 The bank is reported in the local newspaper to have been reobbed in broad daylight yesterday.
2 They were reported to have discovered another ancient tomb in this area.
*完成进行式:在谓语动词表示的动作发生前,不定式表示的动作一直在进行
1 They are said to have been collection folk songs there.
*不定式作主语通常要转换成"It + is/was + adj./n. + 不定式(短语)"
To master a foreign language is not easy.
== It's not easy to master a foreign language.

 

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