This document discusses parallel structure, which is the repetition of a grammatical form within a sentence when comparing items or ideas. By using the same grammatical pattern for each compared element, parallel structure is created. Examples are provided to demonstrate parallel versus non-parallel structures. The document also outlines how to use parallel structure when connecting phrases with coordinating conjunctions, correlative conjunctions, words of comparison, and in lists. Revising sentences and choosing the option with correct parallel structure is practiced. Sources for further information on parallel structure are listed.