Relative clauses are used to join information that is repeated. They contain a relative pronoun like who, which, that, where, when or whose to refer back to the antecedent. Relative pronouns depend on whether the antecedent is a person, animal, thing, time or place. Other relative pronouns include whose for possession, when for time, where for place, why for reason, and whom for people after prepositions. The document also provides examples of defining different occupations using relative clauses.