Relative Pronouns

relative pronoun	use	example
who	subject or object pronoun for people	I told you about the woman who lives next door.
which	subject or object pronoun for animals and things	Do you see the cat which is lying on the roof?
which	referring to a whole sentence	He couldn’t read which surprised me.
whose	possession for people animals and things	Do you know the boy whose mother is a nurse?
whom	object pronoun for people, especially in non-defining relative clauses (in defining relative clauses we colloquially prefer who)	I was invited by the professor whom I met at the conference.
that	subject or object pronoun for people, animals and things in defining relative clauses (who or which are also possible)	I don’t like the table that stands in the kitchen.

Examples : 

1. A monk is a man. The man has devoted his life to God.
   A monk is a man who has devoted his life to God.
2. I have one black cat. His name is Blacky.
   I have one black cat, whose name is Blacky.
3. A herbivore is an animal. The animal feeds upon vegetation.
   A herbivore is an animal that feeds upon vegetation. 
4. Carol plays the piano brilliantly. She is only 9 years old.
   Carol , who is only 9 years old, plays the piano brilliantly.
5. Sydney is the largest Australian city. It is not the capital of Australia.
   Sydney , which is not the capital of Australia, is the largest Australian city.
6. We ordered a book. It was very expensive.
   The book we ordered was very expensive. 
7. This is a house. Jack built this house.
   This is the house that Jack built.
   
8. This is a bank. This bank accepted my identification.
   She is a bank teller. She helped us open an account.
   
9. This is the bank that accepted my identification.
   She is the bank teller who helped us open an account

.