It is a pity that he could not come .这句话是主语从句吗?请分析一下句子成分,It is unusual for him to be late .这里的it是形式主语,to be late是真正的主语,麻烦分析一下句子成分,

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It is a pity that he could not come .这句话是主语从句吗?请分析一下句子成分,It is unusual for him to be late .这里的it是形式主语,to be late是真正的主语,麻烦分析一下句子成分,
It is a pity that he could not come .这句话是主语从句吗?请分析一下句子成分,
It is unusual for him to be late .这里的it是形式主语,to be late是真正的主语,麻烦分析一下句子成分,

It is a pity that he could not come .这句话是主语从句吗?请分析一下句子成分,It is unusual for him to be late .这里的it是形式主语,to be late是真正的主语,麻烦分析一下句子成分,
He could not come 这件事情是一个遗憾.
It 是形式主语,真正的主语是that 引导的从句.
这句话就等于:That he could not come is a pity.
It is + 形容词 (for sb.) to do sth.to do sth 是真正的主语,it 只是形式主语.
你说得很对!很棒!
祝学习愉快!

这是it的形式主语结构 真正的主语是he could not come