例句: It is easy to read a book it这里是形式主语.真正的主语是to read a book,所以这句话可以改为 To read a book is easy.(读书很简单) 但是,外国人不喜欢把长长的主语放在句首,显得麻烦.所以这时候,形式主语就“应运而生”了. what 引导的主语从句: what you said is wrong. what you said 就是 主语,这个主语就是由 what 引导的从句.本回答被网友采纳
第2个回答 2008-06-17
It做形式主语IT'S important to learn English. What引导的主语从句What important is to learn English.