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[自我归纳二]

动词不定式可在句子中充当主语、宾语、表语、补语、定语和状语。

★作主语,一般表示具体的某个动作,谓语动词用第三人称单数(句1);有时为了避免句子头重脚轻,常用it作形式主语,而把真正的主语不定式放在句尾(句2)。

★作宾语(句3) ;若带有宾语补足语时,常用it作形式宾语,而将真正的宾语不定式后置(句4) 。

★作,常用来说明主语的具体内容(句5) 。

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