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③ 作宾语。如：
She wanted to ask you a question.
He forgot to turn off the light.
We decided to hold a class meeting.
常见的可以用不定式作宾语的动词有：like, love, begin, start, try, ask, prefer, hate, find等，有些形容词可接不定式，这种不定式也可作宾语。如：
I’m very glad to see you
He’s sure to come.
④ 作宾语补足语
不定式是用来补充说明宾语的，通常不定式的动作是宾语发出的。可以带不定式作宾补的动词有：ask sb. To do sth.
want sb. To do sth.
tell sb. To do sth.
like sb. To do sth.
help sb. (to) do sth.
还有些动词可以跟省略to的不定式作宾语补足语。如：hear, watch, see, feel, make, let, have等。如：
I often help my mother do housework.
The policeman asked the driver to stop.
The teacher asked us not to talk in class
I want you to buy some bananas for me.
We saw him play football. We felt the house shake.
⑤ 作定语：常常放在所修饰的名词、代词之后，如：
I have a lot of work to do.
He wants something to drink.
⑥ 作状语。如：
He went to the station to meet his friend.(表目的)
She has gone to the market to buy some vegetables.(表目的)
I’m so glad to hear that you have passed the exam.(表原因)
The boy is too young to go to school.(表结果)
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