Below are examples of sentences that are parallel and sentences that are not.
Parallel structure should be used for items in a series, and be sure that three or more items are separated by commas. A comma should never go after the last item. The series can consist of words, phrases, or clauses.
Use parallelism when connecting ideas with a coordinating conjunction (paired items).
A special thanks to Laurie Kirszner and Stephen Mandell’s Writing First, published by Bedford/St. Martin’s in 2015.