We use defining relative clause to specify what person, thing or place we want to talk about. We ____ commas in defining relative clauses. We use non-defining relative clauses to give extra information about a person, a thing or a place. We ____ commas in non-defining relative clauses. We ____ omit pronouns who, which or that in defining relative clauses when the pronoun is the ____ of the relative clause.

Defining and non-defining clause

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