This document discusses the use of demonstrative pronouns in English. It explains that "this" and "these" refer to things that are near in time or distance, while "that" and "those" refer to things that are far away. It provides examples of using the demonstrative pronouns in both singular and plural forms. The document also discusses other uses of demonstrative pronouns like introducing people and referring to things in the past. It includes exercises and bibliographic references for further information.