Some people think it impossible to control the population growth.It is /was +adj.to do sth 是不定试做主语的常用句型.这里为什么用it impossible而不是it's impossible

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Some people think it impossible to control the population growth.It is /was +adj.to do sth 是不定试做主语的常用句型.这里为什么用it impossible而不是it's impossible

Some people think it impossible to control the population growth.It is /was +adj.to do sth 是不定试做主语的常用句型.这里为什么用it impossible而不是it's impossible
Some people think it impossible to control the population growth.
It is /was +adj.to do sth 是不定试做主语的常用句型.这里为什么用it impossible而不是it's impossible

Some people think it impossible to control the population growth.It is /was +adj.to do sth 是不定试做主语的常用句型.这里为什么用it impossible而不是it's impossible
如果是 think it's impossible to control ...
那后面那个句子就是跟在think后面的宾语从句,it做形式主语
如果是 think it impossible to control
it 做宾语,impossible 后面做it的补语.传说中的宾补.

think it impossible to do sth.=think that it is impossible to do sth. that可以省略,it's impossible可以用,但是前者更常用,符合习惯

这里 impossible 是it补语!就是think something adj...(即一个形容词),如要用it's impossible,则整个句子是结构划分就变了,Some people think it is impossible to contr.....,这里it is impossible to contr...是think的宾语!