动词不定式用作主语。此时,谓语动词用第三人称单数形式。需要注意的是,如果主语较长,可以用it做形式主语,而将真正的主语动词不定式放在句尾。
02动词不定式用作表语。例如:The most important thing is to believe her.
03动词不定式用作宾语。例如:I like to eat apples.
04动词不定式用作宾语补足语。例如:He tells me to write it like this.
05动词不定式用作定语。例如:I have lots of things to do.
06动词不定式用作状语。例如:It is too late to leave there.
07特殊疑问词+动词不定式。例如:I don't know how to do it.
08动词不定式有时不带to.例如:He saw a cat enter the box.
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