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.,

Defining vs Non-defining

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