It's kind of you to think so much of us.这里的不定式 为什么是作主语的部分?

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It's kind of you to think so much of us.这里的不定式 为什么是作主语的部分?

It's kind of you to think so much of us.这里的不定式 为什么是作主语的部分?
It's kind of you to think so much of us.
这里的不定式 为什么是作主语的部分?

It's kind of you to think so much of us.这里的不定式 为什么是作主语的部分?
原因:
形式主语it
作为形式主语的it并无实际语义,只是为满足语法上的需要,避免句子头重脚轻,它代替
的是句子的逻辑主语,概括起来会有如下情况:
句子的逻辑主语为不定式
如:It is very kind of you to give me a hand in time.
It is my pleasure to address the meeting.
It was pretty hard for him to bring up the child on his own.
真正的主语是后面的不定式短语

这应该是个强调句式吧
it is +被强调部分+(that)被强调部分(包括主语、宾语、表语、状语)
转过来就是
you are kind to think so much of us.
好久没学英语了,但愿没错

不定式的功能有很多 表示目的 表示结果 修饰 等等 这里是关于it和不定式的特殊用法 it是形式主语 to think so much of us是真正主语 因为太长放在后面 原句是To think so much of us is kind of you.