麻烦帮我分析一下下面句子的成分：So that is what you are doing out here?
问题描述：
麻烦帮我分析一下下面句子的成分：So that is what you are doing out here?
So that is what you are doing out here?
so that is what you had to do.
After what seemd an endless wait,it `````
特别说明带what的部分,是什么句子,做什么成分~
答
一二两句what引导表语从句,what充当从句中的宾语成分.第三句的what在状语从句中充当主语.