This document provides information about closed class words in English grammar. It defines closed class words as function words that do not accept new members, such as pronouns, prepositions, determiners, and conjunctions. The document then lists examples of different types of closed class words and provides exercises for students to practice using them. It focuses in particular on pronouns, defining personal pronouns, possessive pronouns, reflexive pronouns, demonstrative pronouns, and interrogative pronouns.