求问一个形式主语的句子 it is advisable to find out what its advocates are aming at to

Question

求问一个形式主语的句子
it is advisable to find out what its advocates are aming at
to found out 作为真正的主语，书上说what从句是宾语从句，主语怎么能直接跟宾语从句呢?没有谓语吗?不该是主语从句吗？例: it is important that XXX也是主从哇...

Answer 1

what its advocates are aming at是to find out的宾语从句。
to find out what its advocates are aming at是动词不定式短语做真正主语。
这个结构就是：
it+be+adj+to-v
又如
It is impossible to finish the work in such a short time.追问

动词不定式做主语怎么就能直接跟宾语从句了?那也得要个谓语吧?

追答

动词不定式是由动词变过来的，它也可以接宾语，状语的。
例句中的the work就是宾语；in such a short time是状语。
从句做find out的宾语，就是宾语从句。
It is difficult to understand what he says.
what he says是understand的宾语
to understand what he says就是真正主语。