adjective clause

adjective cluse (dalam bahasa indonesia berarti yang )
1. who.(someone)
  followed by verb, to be, aux. verb,modal
ex:
the girl who is wearing redhat is a girlfriend.

2. which (something)
followed by verb, to be,aux.verb,modal
ex:
the castle is old enough has been sold

3. whom
followed by subject ( i,you,we,they,he,she,it)
ex :
the book whom you borrowed has lost

4.whose
followed by kepemilikan
ex:
maria is a secretary whose father is a headmaster.