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She showed me a photograph of her son. Her son is a policeman.
She showed me a photograph of her son, who is a policeman. NON- DEFINING.
I’ve just bought some books about astronomy. I’m very interested in astronomy
I’ve just bought some books about astronomy, which I’m very interested in. NON-DEFINING
My sister is visiting us next week. You once met her
My sister, who you once met, is visiting us next week. NON- DEFINING.
That man over there is an artist. I don’t remember his name.
That man over there, whose name I don’t remember, is an artist. NON- DEFINING
The storm caused a lot of damage. Nobody had been expecting the storm.
Nobody had been expecting the storm, which caused a lot of damage. NON- DEFINING