This document provides an overview of English grammar. It begins by defining grammar as the structural foundation of expressing oneself in language. It then discusses different types of grammar, including descriptive grammar which refers to how language is actually used, and prescriptive grammar which refers to how some think the language should be used. The document also covers parts of speech, negation, clause and sentence structure, the history of English grammar, and defines English grammar as the body of rules describing the structure of expressions in the English language.