Parallel Structure Checker

Find and fix parallelism errors in lists and comparisons

Parallel structure means items in a list or comparison use one grammatical form. “She likes reading, swimming, and to hike” breaks the pattern because the last item is an infinitive. This checker marks the uneven item, explains the rule and suggests a matching form. All checking happens in your browser.

Updated 2026-10-28

Read the full guide: What is parallel structure?

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