Grammatical structure in the English language is simply the arrangement of words, phrases, and clauses in a sentence. Naturally, this definition brings to mind those parts of speech in the English language that are like the building blocks of grammar and sentence structure. It is not enough to just know what these parts of speech are, but it is also useful to know how they are used in communication, and how they are organized to form phrases, grammar, and sentence structures that readers will understand.