This document provides instruction on parallel structure and parallelism in sentences. It begins by introducing the topic of parallelism and defining it as using the same grammatical form for equal ideas. Several examples are provided to illustrate parallel and non-parallel sentences. The document then discusses the benefits of parallelism, including making sentences more graceful, clarifying meaning, and showing connections. Additional examples are used to demonstrate parallelism errors and how to correct them. The document concludes by providing exercises for the reader to identify parallel and non-parallel sentences.