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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...