1
To introduce an adjective clause that modifies a noun of place
2
To refer things as the object of verbs in adjective clauses and it is a little bit more formal
3
To indicate posession in adjective clause
4
Modifies a noun of time
5
To refer people but in another way
6
To refer people as the object but in an informal conversation
7
to refer people as a subject of verbs in adjective clause
