How to Fix Parallel Structure
A clear guide to identifying and correcting parallel structure in your writing.
What parallel structure actually is
Parallel structure means using the same grammatical form for items that play the same role in a sentence. When you list three actions, all three should match: all verbs, all gerunds, or all infinitives. When the forms mix, the sentence feels bumpy even when no rule is formally broken.
Parallelism is not decoration. It is how readers sense balance. A sentence built on matching parts reads faster and feels more confident. When the pattern breaks, the reader stumbles, and your idea loses force.
Diagnosing broken patterns
| Broken pattern | Why it feels off | Parallel fix |
|---|---|---|
| She likes hiking, swimming, and to run | Two gerunds, one infinitive | She likes hiking, swimming, and running |
| The work was fast, careful, and with skill | Two adjectives, one phrase | The work was fast, careful, and skilled |
| He promised to write, to call, and visiting | Two infinitives, one gerund | He promised to write, to call, and to visit |
| The plan is bold, is clear, and makes sense | Two verbs, then a different verb form | The plan is bold, clear, and sensible |
How to find and fix a break
- 1Find the list or comparison
Locate the joined items, whether joined by and, or, or a colon.
- 2Label each item form
Mark whether each is a noun, a verb, an adjective, or a phrase.
- 3Pick the dominant form
Choose the form most items already use and convert the rest.
- 4Re-read for rhythm
If the sentence still sounds uneven, rewrite the items so the verb or preposition appears, or is understood, in each.
When items share a preposition or auxiliary verb, you can usually drop it after the first item. But if dropping it creates doubt, repeat it. Clarity beats brevity.
Common places parallelism breaks
- bulleted lists, where each point should start with the same part of speech
- headings and subheadings, which read better with matching form
- paired conjunctions like either/or, neither/nor, and not only/but also
- resumes and cover letters, where mixed verb forms dilute impact
From awkward to automatic
Fixing parallel structure is a matter of training your ear, then confirming with your eye. Read the sentence aloud and notice where you trip. That trip is almost always a broken pattern. Once you label the forms and align them, the sentence settles.
For long documents, use a checker to flag mismatched list items. The free Grammar Checker at AI Humanizer Lab catches these patterns without a signup, and because it has no word limits, it works for full reports and manuscripts in a single pass.
Items of equal weight deserve equal grammar. Match the forms and the sentence carries itself.
Building the rhythm into your drafts
Parallel structure is something you can build into a first draft once it becomes a habit. When you start a list, pause and decide the form, then hold it across every item. That small decision up front saves a round of fixes later and makes the sentence read with confidence from the start.
The payoff shows up in longer documents, where matching forms across headings, bullets, and conclusions give the whole piece a steady rhythm. Readers feel that rhythm as competence, even when they cannot name the rule. It is one of the cheapest ways to make your writing sound professional.
Read your lists aloud. If you stumble on the third item, the form has probably broken. Your ear catches uneven rhythm faster than your eye catches mismatched grammar, so trust the stumble and align the forms.
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