 We can use prepostions with the adjective clauses.  These prepositions can be BEFORE the clause or at the END of the sentence.

 TO…  FOR…  He is the man TO WHOM you should talk to  This disco is the place TO WHICH I want to go to.  This is the restaurant FOR WHICH John works

 Some adjectives clauses have the pattern:  QUANTIFIER + FOR + ADJECTIVE CLAUSE (WHOM, WHICH, WHOSE)

 ALL OF  MOST OF  A NUMBER OF  SOME OF  A FEW OF  SEVERAL OF  A COUPLE OF  TWO OF  I have friends ALL OF WHO came to the party  The movies MOST OF WHICH I watched were great.  I have some books A NUMBER OF WHICH I have read already  I visited a lot of place SOME OF WHICH had great legends  That is the teacher, TWO OF WHOSE students did not pass

 These clauses refer ONLY to things  It is formed by:  NOUN + OF + WHICH  Harry Potter, AN IDEA OF WHICH books kids should read, was great.