The relative pronouns are:

 

Subject	Object	Possessive
who	who(m)	whose
which	which	whose
that	that

We use who and whom for people, and which for things.
Or we can use that for people or things.

We use relative pronouns:

• after a noun, to make it clear which person or thing we are talking about:

the house that Jack built
the woman who discovered radium
an eight-year-old boy who attempted to rob a sweet shop

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