用法:pron. 谁什么人Who is your favourite writer?

谁是你特别喜欢的作家

Who invented the steam engine?

谁发明了蒸汽机

Who is your commanding officer?

谁是你们的指挥官

Who invented the question mark?

谁发明了问号

I'm not certain who was there.

我无法确定谁当时在场。