The document discusses the eight main parts of speech in English language: nouns, pronouns, verbs, adjectives, adverbs, conjunctions, prepositions, and interjections. It provides definitions and examples of each part of speech, and categorizes them further into subclasses. For example, nouns are classified as proper vs. common, collective vs. concrete, gerunds; pronouns as personal vs. possessive vs. reflexive; verbs as action vs. linking vs. auxiliary; and adverbs as those of manner, time and place. The document serves as a guide to the key parts of speech and how they are used in the English language.