Defining Relative Clauses: don't have commas, who/that - which/that - whose - when - where , who and which can be omitted when there is a second subject, the clause provides essential/vital information, She's the girl who won the marathon., you can use THAT instead of who or which, Non-defining Relative Clauses: use commas (*make pauses in spoken English), who - which - whose - when - where, you cannot use THAT instead of who or which, the relative pronouns cannot be omitted, the clause provides additional information, Ramiro, who is from Bolivia, studied with me at university.,

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