who, which, when, why, whose, where, that - Relative pronouns, what  - This can't be a relative pronoun, We use a comma - in a non-defining relative sentence, We don't use a comma - in a defining relative clause, Non-defining relative sentence - It is a sentence that gives us extra information., Defining relative clause - It is essential information that is needed in the sentence to undertand the idea. , who, which - These can be substituted by THAT in a Defining Relative Clause,

Defining and non-defining relative clauses

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