This document discusses defining and non-defining relative clauses. Defining relative clauses provide essential information about the noun they refer to without commas. Non-defining relative clauses provide non-essential extra information and use commas. It also discusses relative pronouns like who, which, that, whose, where, why, when and relative phrases. Optional relative pronouns are omitted when the pronoun is the object of the relative clause. Prepositions are usually placed at the end of relative clauses in everyday speech.
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