This document provides an overview of prepositions, conjunctions, interjections, and articles. It defines each part of speech and provides examples. For prepositions, it lists common prepositions and examples of prepositional phrases. For conjunctions, it distinguishes between coordinating conjunctions and correlative conjunctions. It defines interjections and gives examples. Finally, it discusses the indefinite article "a"/"an" and the definite article "the", explaining their uses. The document is intended to teach English grammar.