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1. We use defining relative clauses to give essential information about someone or something – information that we need in order to understand what or who is being referred to. A defining relative clause usually comes immediately after the noun it describes.

1.1. when we are talking about things, we use that or which (not who) in a relative clause

1.2. whe use WHO in a relative clause when we are talking about peoples (no things)  example: The woman who lives next door.

1.3. . examples: 1*He is the guy who lives there 2*My cat, which is fat, is sleeping 3*I don’t like your friend that was with you today

2. We usually use a relative pronoun (e.g. who, that, which, whose and whom) to introduce a defining relative clause (In the examples, the relative clause is in bold, and the person or thing being referred to is underlined.

2.1. examples:                        1*He was hired by the professor whom I met yesterday.                                                        2*Do you know the guy whose mother is sick? 3*he house where we lived was very big