Relative clauses give us information about the person or thing mentioned. Non-defining relative clauses give us extra information about someone or something. Hence, the clauses are constructed below:
1. Defining clause
The skirt I buy cost £15
2. Defining clause
That is the school where my dad work as a maths teacher
3. Non-defining clause
Lucy photos, which is very good, win the art prize every year
4. Non-defining clause
May is a nice girl, whose family own a shop on the High street
5. Non-defining clause
My best friend Jack, who writes songs is very creative
6. Defining clause
Sally just starts work at a sports centre where she helps disabled athletes
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