We use relative clauses to describe or tell something more about a person or a thing. A relative clause always starts with a relative pronoun. Relative pronouns in English are who, which, whose and that. Whom is also sometimes used, but very formal.
I dated a girl. She lives next door.
This is my new laptop. I bought it two days ago.
I was invited by Peter. I met him last Monday.
I have a friend. His brother is a mechanic.
Whose bike is it? It’s Susan’s.
Who – when we talk about people
There are also non-defining relative clauses. We use them to give extra information about the person or thing that is not important. We use commas in non-defining relative clauses, but we don’t use that.
Sarah, who I met yesterday, worked at my father’s company.
The relative pronoun can be left out when the pronoun refers to the object of a sentence.
This is the watch her parents bought her for her birthday.
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