who
01
谁
used in questions to ask about the name or identity of one person or several people
例子
Who are those people sitting at the back?
谁是那些坐在后面的人 ?
02
谁, 那个人
used to refer to people or animals with names
例子
The person who is standing over there is my brother.
站在那边的人是我的兄弟。
03
谁, 那个人
used to represent a person as the subject or object of verb or preposition in a sentence
例子
I know who did it.
我知道谁做了这件事。
