This document uses the analogy of a bicycle to explain the basic structure and components of a sentence. It states that a sentence requires two essential parts: a subject and a predicate. These two parts form the two wheels of the bicycle, with the subject as one wheel telling who or what, and the predicate as the other wheel telling what about the subject. The document provides examples of basic sentences and how more details can be added to each wheel through modifiers like adjectives and adverbs. It also discusses dependent and independent clauses, as well as fragments that lack either a subject or predicate. Overall, the bicycle analogy aims to give a concise and concrete way to understand sentence structure.