动词不定式做主语:
to get up early is necessary 早起是必要的
it做形式主语
it's necessary to get up early
动词不定式做宾语
he decided to buy a new car
动词不定式做宾语补足语
I like you to keep everything tidy
疑问词加不定式做宾语
please show us how to do that
动词不定式做表语
his wish is to be a policeman
动词不定式做状定语
we need someone to help
I have many letters to write
如果不定式的动词是不及物动词,后面须加上适当的介词
I am looking for a room to live in.
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