what you are doing

如果这句句子不采用疑问形式,那它是一句名词性从句,不能独立存在,可作另一句句子（即主句）的主语、宾语、表语、同位语等.例如：
主语：What you are doing now is very important to us.
你现在正在做的事对我们来说非常重要.
宾语：I want to know what you are doing now?
我要知道你现在在做什么.
表语：The question is what you are doing now.
问题是你现在正在做什么.
同位语：The question what you are doing now dosen't worry us too much.
你现在正在做什么的问题并没有给我们带来太多的担忧.