RELATIVE CLAUSE Relative pronoun - Which, That, Who, Whom, Whose, where, when - At Which, by Which, on Which, during Which, in Which - Quantity of Which: some of Which, both of Whom, several of Which Relative pronoun Use Who Subject (people) Whom Object (people) Whose Possessive (people/ things) Which Subject/ Object (things) That Subject/ Object (people/ things) Where Adverb (place) When Averb (time) Defining relative clause/ restrictive relative clause Non-defining relative clause/ nonrestrictive relative clause - Identify the thing you are talking about - No comma between relative clause and the noun it modifies - That can replace Who, Whom, Which - The relative pronoun can be left out if it refers to the object - Give additional, non-essential information - Must have commas between relative clause and the noun it modifies - That cannot be used - The relative pronoun cannot be left out ***Note: That is used in defining relative clause only