This document provides an introduction to word classes and parts of speech. It discusses the different types of nouns, including common nouns, proper nouns, countable nouns, and uncountable nouns. It also covers adjectives and how they are used to describe nouns. Finally, it examines verbs and the different verb forms, including main verbs, auxiliary verbs, and the perfect and progressive aspects. The document is intended to teach the basics of grammar and parts of speech.