Proper Parallel Structure

Parallel structure occurs when a sentence contains a list of words, phrases, or clauses, usually connected by coordinating conjunctions (and, or, etc.).

When a sentence contains a list of items, each item should be of the same type and the same form.

Words, Phrases, and Clauses

Do not mix words with phrases, or phrases with clauses, in a parallel structure.

Matching Forms

Every element in a list should have the same form.  If one element is a verb ending in "ing," every element should be a verb ending in "ing."  If one clause is in the active voice, there should not be any clauses in the passive voice.

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