How to Use Parallel Structure in English Writing for Clarity

You know that moment when you read a sentence and something feels off — but you can't put your finger on it?

Chances are, the writer broke parallel structure. It’s one of those grammar rules that makes a huge difference in how clear and polished your writing sounds. And the good news? It’s super easy to fix once you know what to look for.

What is parallel structure?

Simply put, parallel structure (or parallelism in grammar) means using the same grammatical form for items in a list, series, or comparison. When you keep things balanced, your reader’s brain processes your message faster. When you don’t, your sentences feel clumsy and confusing.

Compare these two versions:

❌ She likes hiking, to swim, and going for bike rides.
✅ She likes hiking, swimming, and going for bike rides.

The second one flows naturally because all three activities use the same -ing form. That’s parallelism in action.

Where parallel structure matters most

Parallelism isn’t just about lists — it pops up in several common patterns. Here are the ones that cause the most trouble for learners.

1. Lists and series

Any time you write a series of items (nouns, verbs, adjectives, phrases), keep them in the same form.

Not parallel: The teacher told us to read the chapter, write an essay, and that we should study for the quiz.
Parallel: …to read the chapter, to write an essay, and to study for the quiz.
(Or: …reading the chapter, writing an essay, and studying for the quiz.)

2. Pairs with conjunctions

Words like and, but, and or connect equal elements. If you write “I enjoy cooking and to eat,” you’re mixing an -ing form with an infinitive. Fix it by matching:

I enjoy cooking and eating.
I like to cook and to eat.

3. Comparisons

When you compare two things, the structure should mirror itself.

❌ Swimming is more fun than to run.
✅ Swimming is more fun than running.

4. Correlative conjunctions

Pairs like either…or, neither…nor, not only…but also demand equal structures.

❌ He is not only talented but also has a great work ethic.
✅ He is not only talented but also hardworking.

See the difference? The first mixes an adjective (talented) with a verb phrase (has a great work ethic). The second keeps both as adjectives.

A quick way to check your own writing

Before you hit publish on an email, blog post, or school assignment, scan for any list or pair. Ask yourself: “Are all the items in the same grammatical form?” If one is a noun, make the rest nouns. If one is a verb in base form, match it.

If you’re unsure, try reading the sentence out loud. Your ear will often catch the wobble before your eye does.

Common pitfalls (and how to avoid them)

• Mixing infinitives and gerunds – Use all to + verb or all verb-ing.
• Changing verb tenses in the middle of a list – Keep tenses consistent.
• Forgetting to repeat prepositions or articles – Sometimes you need to repeat the word to keep the structure clear.
  Example: He was interested in the history, the culture, and the food. (Not “the history, culture, and food” if each needs its own “the.”)

That last point is a gray area. In casual writing, dropping the second “the” is fine. But in formal or academic work, repeating it adds clarity.

Why this matters for your English

Parallel structure helps you sound more natural and authoritative. Native speakers use it without thinking — and when learners use it correctly, their writing instantly feels more advanced.

Think of it like straightening a picture frame. It’s a small adjustment, but the whole room looks better.

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Now you know the rule. But knowing and doing are different things. The best way to master parallelism is to practice with real sentences.

At English Measure, you can test your writing skills — and your reading, listening, and speaking too — for free. See where you stand and get instant feedback.

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