RELATIVE CLAUSES DEFININGNON-DEFINING
RELATIVE PRONOUNS WHO (people) WHICH (things) THAT (people and things) WHOSE (possessive) WHERE (place) WHEN (time)
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.
NON-DEFINING MMMMary lives next door. She has a nice dog. MMMMary lives next door. She has a nice dog. MMMMary, who lives next door, has a nice dog. MMMMARY has a nice dog.