It is necessary for him to do so.中的for him在句中是什么成份?主语补足语吗?

圆8880 1年前已收到2个回答举报

绝对不回头幼苗

共回答了13个问题采纳率：92.3% 举报

It is necessary for him to do so.
动词不定式【 to do so】作主语,用形式主语it代替之
如果要说明不定式的动作是谁发出的,可以在不定式前加一个以for引起的介词短语,即为状语.
新春愉快!

1年前

白色粉末幼苗

共回答了2个问题举报

我的老师说是逻辑主语。

1年前

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