This document discusses the proper use of demonstrative pronouns in English. It explains that "this" and "these" refer to objects close to the speaker in space or time, while "that" and "those" refer to objects farther away. It provides examples of sentences using each demonstrative pronoun correctly. The document concludes that learning the basic rules about whether a pronoun is singular or plural, and whether it refers to something near or far, will help one to correctly use demonstrative pronouns.