文档介绍：在句子中充当除谓语以外的句子成分的动词形式叫做非谓语动词
。在句中可起名词,形容词,副词的作用,在句中充当主语，宾语，表语,补语,,可以承担句子se， prefer， 假设不定式（宾语）后面有宾语补足语，那么用it作形式宾语，真正的宾语（不定式）后置，放在宾语补足语后面,例如：
Marx found it important to study the situation in Russia。
动词不定式也可充当介词宾语，如:
I have no choice but to stay here.
He did nothing last Sunday but repair his bike。
动词不定式前有时可和疑问词连用，如:
He gave us some advice on how to learn English。
(4)作宾语补足语:
在复合宾语中，动词不定式可充当宾语补足语，如下动词常跟这种复合宾语：want, wish， ask， tell， order， beg, permit， help, advise， persuade, allow， prepare, cause， force, call on， wait for, invite.
此外，介词有时也和这种复合宾语连用,如：
With a lot of work to do, he didn't go to the cinema．
有些动词如make， let， see, watch, hear, feel， have等和不带有to的不定式连用,但改为被动语态时,不定式要加to， 如：
I saw him cross the road。
He was seen to cross the road。
（5）作定语：
动词不定式作定语，放在所修饰的名词或代词后。和所修饰名词有如下关系：
①动宾关系：
I have a meeting to attend.
注意:不定式为不及物动词时，所修饰的名词假设是地点、工具等，应有必要的介词，如：
He found a good house to live in.
The child has nothing to worry about.
What did you open it with?
假设不定式修饰time， place， way，可以省略介词：
He has no place to live。
This is the best way to work out this problem.
假设不定式所修饰名词是不定式动作承受者,不定式可用主动式也可用被动式:
Have you got anything to send?
Have you got anything to be sent？
②说明所修饰名词的内容：
We have made a plan to finish the work。
③被修饰名词是不定式逻辑主语：
He is the first to get here.
(6）作状语：
①表目的：
He w