什么叫主语从句?它与定语从句有什么区别?
问题描述：
什么叫主语从句?它与定语从句有什么区别?
答
主语从句在主句中作主语,如：What he did was good for his health.What he did 作主语,是主语从句
定语从句是修饰前面某个名词,在主句中作定语.如：The thing that he wants is one book.That he wants 在主句中作定语,修饰the thing .