Defining relative clauses-The man who (that) moved to Park Street is Frank.
-Molly lives in a house which (that) is a hundred years old.
- That's the cafe where the children often buy ice cream.
Non-defining relative clauses= extra information- Frank, who moved to Park Street, has a cat.
- Molly's house, which has a tree in the garden, is very old.
-There's a café in the street, where we buy ice cream.