1. RELATIVE CLAUSES DEFININGNON-DEFINING

2. RELATIVE PRONOUNS  WHO (people)  WHICH (things)  THAT (people and things)  WHOSE (possessive)  WHERE (place)  WHEN (time)

3. DEFINING  The girl lives next door. We met her the other day.  The girl who we met the other day lives next door.  The girl [we met the other day] lives next door.

4. NON-DEFINING MMMMary lives next door. She has a nice dog. MMMMary lives next door. She has a nice dog. MMMMary, who lives next door, has a nice dog. MMMMARY has a nice dog.