The document outlines 5 rules for using relative pronouns in adjective clauses: 1) the relative pronoun cannot be omitted if it refers to the subject of the embedded sentence, 2) it can be omitted if it refers to an object, 3) use "whose" if it refers to a possessive, 4) use "where" if there is a preposition of place, and 5) use "when" if there is a preposition of time. Examples are provided to illustrate each rule.