pron. 谁;什么人;关系代词,有先行词;孰
网络 世界卫生组织(World Health Organization); 世卫组织; 何人
Who invented the question mark?
谁发明了问号?
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 is your favourite writer?
谁是你特别喜欢的作家?
I´m not certain who was there.
我无法确定谁当时在场。