Some peple...
问题描述：
Some peple...
Some peple think (_it_) impossible to control the population growth .
为什么用it 而不是it is?
答
这里用it和it is都是正确的.如果只有一个空那当然只能填it.
Some peple think it impossible to control the population growth .
=Some peple think (that) it is impossible to control the population growth .
上面第一句中的it做形式宾语,真正的宾语是不定式短语to control the population growth.因为真正的宾语很长而宾补impossible很短,为避免头重脚轻,用it做形式宾语,而真正的宾语放在后面.
这是 think+宾语+宾补 结构.
第二句是think带宾语从句,it做从句中的形式主语,真正的主语是不定式短语to control the population growth.