This document provides an overview of adjective clauses and relative pronouns in English grammar. It begins by giving examples of different types of adjective clauses, including defining and non-defining clauses. It then discusses the different relative pronouns (who, which, that, whose, whom) and how they are used depending on whether the antecedent is the subject or object of the clause. The document provides exercises for combining simple sentences into complex sentences using relative pronouns and for identifying the appropriate relative pronoun based on the antecedent.