What is grammar in English? At a high level, the definition of grammar is a system of rules that allow us to structure sentences. It includes several aspects of the English language, like: • Parts of speech (verbs, adjectives, nouns, adverbs, prepositions, conjunctions, modifiers, etc.)

Basic Grammar Concepts: Parts of Speech. To start expanding your grammar knowledge, it's helpful to begin with an understanding of the eight traditional parts of speech that make up our sentences: nouns, pronouns, verbs, adjectives, adverbs, prepositions, interjections, and conjunctions.