动词不定式可作主语,宾语,表语,定语,状语,补语。例句如下：
1、作主语
To?clean?the?classroom?is?our?task?this?afternoon.
To?finish?the?work?in?such?a?short?time?seems?difficult.
2.作宾语
Do?you?mind?my?sitting?here?
The?room?needs?cleaning.
3.作表语
Our?task?this?afternoon?is?to?find?more?information?on?the?Internet.
My?dream?is?to?be?a?scientist?in?the?future.
注意:不定式作主语,作表语是都是表明动作是一次性的,将来的。
4.作定语
I?have?nothing?to?do.
--Do?you?have?anything?to?be?done,sir?
--No,thank?you.I?had?my?son?do?it?this?morning.
注意:不定式作定语时要注意主动和被动的区别,如上面两个句子,如不定式的动作是主语所作要用主动式.如不定式的动作不是主语所作要用被动式,如第二个句子。
5.作状语
He?came?here?to?see?me.
I'm?glad?to?see?you.
6.作补语
He?asked?me?to?help?him?with?his?English.
Our?teacher?often?encouraged.