This document discusses the eight main categories of grammar: nouns, pronouns, adjectives, verbs, adverbs, prepositions, conjunctions, and interjections. It provides examples and definitions for each category to explain their functions within sentences. Nouns name people, places, ideas or things. Verbs express actions or link subjects to descriptions. Adjectives modify nouns. Adverbs modify verbs, adjectives or other adverbs. Prepositions show relationships of nouns/pronouns to other words. Conjunctions join words and sentences. Interjections express emotion.