who
Usually pronounced [PH:h][PH:u][PH::] for meanings 2 and 3.
Who is used as the subject or object of a verb. See entries at whom and whose.
1 quest You use who in questions when you ask about the name or identity of a person or group of people.
Who's there?...
2 conj You use who after certain words, especially verbs and adjectives, to introduce a clause where you talk about the identity of a person or a group of people.
Police have not been able to find out who was responsible for the forgeries...
3 pron You use who at the beginning of a relative clause when specifying the person or group of people you are talking about or when giving more information about them.
There are those who eat out for a special occasion, or treat themselves...