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who
01
used in questions to ask about the name or identity of one person or several people
Example
Who are those people sitting at the back?
Who is going to pick up the kids from school?
Who is helping you with your homework?
02
used to refer to people or animals with names
Example
The person who is standing over there is my brother.
I met a woman yesterday who knows how to play the piano.
The doctor who treated me was very kind.
03
used to represent a person as the subject or object of verb or preposition in a sentence
Example
I know who did it.
They will announce who gets the promotion.
We discovered who wrote the mysterious letter.
