restrictive and non-restrictive relative clauses

Definition of relative pronoun: 

a relative pronoun is a pronoun that introduces a relative clause. It is called a"relative" pronoun because it "relates" to the word that it modifies.  There are five relative pronouns: who , whom , whose , which , that.

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	Examples
Restrictive (defining ) relative clauses	Subject	- The boy who/ that sent an email  last week is my brother.	people
		- The cat which/ that bit me was black.	things
	Object	- The boy whom/ who/ that I sent an email last week is my brother. - The person I called last night is my  friend.	people
		- The story which/ that I am reading is interesting. - The story I am reading is interesting .	things
	Possessive	- The woman whose  house is new is my  neighbour.	people
		-  I know the man whose car  is new.	things
Non-restrictive (non-defining) relative clauses	Subject	- The man, who  is 40 years old , is our teacher.	people
		- Fruits, which are really cheap in Morocco , can be bought now  for a reasonable price.	things
	Object	- The teacher, whom/who I respect , has just published two books.	people
		- The pictures, which he admired , were stolen.	things
	Possessive	- My brother, whose car is new , is a teacher.	people
		- The house, whose windows were broken , was stolen by a stranger.	things