分析：It is nessary for us to learn from each other.

It is nessary for us to learn from each other.

句子成分的分析，为什么书上说红色部分是句子的主语，那么句子的谓语是哪个，It is necessary 是什么成分？

It is nessary for us to learn from each other.

It：形式主语

is：系词

necessary：表语

for us to learn from each other: 不定式复合结构作真正主语。（不定式带有自己的逻辑主语和状语）

曹荣禄 -

擅长：动词用法,句法问题 | 采纳率 82% | 回答于 1秒前

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