动词不定式的基本形式为to+动词原形.

1.动词不定式做主语.谓语用第三人称单数形式.如果主语较长则用it做形式主语,将真正的主语动词不定式放到句尾.eg

To see is to believe.

It's a bad habit to run after dinner.

2 做表语.the important things is to save lives.

3 做宾语he likes to play with children.

4做宾语补足语.形容词做宾补时.常用it做形式宾语.把真正的宾语放到宾补之后.

he feels it happy to help others.

5做定语she asked me to help her with her English.

6做状语you are never too old to learn.(结果状语）

7特殊疑问词+动词不定式.I am thinking about what to say.

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