This document discusses parallelism in writing. It defines parallelism as using similar grammatical structures for similar parts of a sentence. Using parallel structure allows writing to flow smoothly and avoids misunderstandings. Some examples of parallel structure include using nouns with nouns, verbs with verbs, and adjectives with adjectives. Parallel structure should be used when joining items with coordinating conjunctions like "and" or "or", in comparisons, and with paired words like "both/and". The document provides exercises to identify correct and incorrect examples of parallel structure.