疑问词作主语的情况有who、what、which 具体怎么表现?

1.第一问不太懂得楼主想问什么?
如果疑问词刚好做句子主语,则句序和陈述句是一样的,除了主语用的是疑问词之外.
如：Who is speaking English over there?对比陈述句：Tom is speaking English over there.
What happened just now?对比陈述句：A traffic accident happened just now.
I don't know which is the way to the school.对比简单问句：Which is the way to the school?
2.宾语从句的引导词如果直接做句子主语,则句序都是不用改变的.
再如：I‘d like to know who is speaking English over there.
I wonder what happened just now.
另外,这几个句型也是特殊的不用变化句序的：
what's wrong with...
what's the matter/trouble/problem with...