What 引导主语从句时在从句中充当句子成分,如主语.宾语.表语,而that 则不然.

问题描述:

What 引导主语从句时在从句中充当句子成分,如主语.宾语.表语,而that 则不然.
请问例子?两个都要.例子尽量多,最好还有点解释

What surprised me most was that he had been married.(what在从句中作主语)What you told me this morning is unbelievable.(what 在从句中作宾语)What his phone number is is still unknown to me.(what在从...