From Formal to Natural: Rewriting Stiff ESL Academic Prose Into Human-Sounding English

You wrote the essay yourself. The grammar checks out. And yet your professor scribbles “stiff” or “awkward” in the margin, and a classmate says it “doesn’t sound like a real person.” That gap between correct English and natural English is one of the most frustrating parts of writing in a second language—and it’s fixable without years of extra study.

Key takeaways

• Stiff ESL prose usually comes from learned safe patterns—heavy nouns, hedged claims, textbook transitions—not from weak English.
• The fastest fixes are mechanical: turn nouns back into verbs, cut empty openers, and let sentence length vary.
• Read your draft out loud; if you’d never say it to a classmate, it probably reads as unnatural on the page.
• Natural doesn’t mean casual. You can keep an academic register and still sound like a person.
• Over-formal, evenly-paced writing is also what AI detectors tend to flag, so writing naturally helps on two fronts at once.

Why “correct” English can still sound robotic

Here’s the thing most grammar guides skip: a sentence can be perfectly correct and still feel wrong. That’s because naturalness lives in rhythm, word choice, and phrasing—not in whether your verb agrees with your subject.

Many ESL writers learn academic English from textbooks and IELTS prep, which reward a very particular style: dense, cautious, impersonal. So you absorb phrases like “it can be observed that” and “a significant amount of consideration must be given to.” Each one is grammatically fine. Stacked together, they read like a machine translated a policy document.

There’s a fairness problem buried in here too. A 2023 study by Liang and colleagues at Stanford found that GPT detectors flagged TOEFL essays by non-native English writers as machine-generated far more often than essays by native speakers—in their tests, more than half of the non-native essays were misclassified. The tools weren’t built to target ESL students. They just measure how predictable text is, and over-formal, evenly-paced writing happens to look predictable. So the same habits that earn a “stiff” comment can also trip a detector. You can read more about the statistics behind AI detectors if you want the mechanics.

Good news: the fixes for “stiff” and the fixes for “flagged” are mostly the same.

The five habits that make ESL prose stiff

1. Burying verbs inside nouns

This one does the most damage. English loves verbs, but academic ESL writing tends to freeze them into nouns and then prop them up with a weak helper verb.

• *Stiff:* “The researcher conducted an investigation of the data.”
• *Natural:* “The researcher investigated the data.”

“Conducted an investigation of” is three words doing the work of one. Once you start noticing this pattern—”make a decision” (decide), “give consideration to” (consider), “perform an analysis” (analyze)—you can cut a surprising amount of stiffness in one pass.

2. Empty openers

Phrases like “It is important to note that,” “It can be said that,” and “In today’s modern society” feel academic, but they delay your actual point and add nothing. Native academic writers use them too, but sparingly. ESL drafts often open three paragraphs in a row this way.

• *Stiff:* “It is important to note that pollution affects public health.”
• *Natural:* “Pollution affects public health.”

If the sentence still makes sense after you delete the opener, delete the opener.

3. Transition stacking

“Moreover,” “Furthermore,” “In addition,” “Additionally”—one after another, often starting consecutive sentences. Transitions are signposts; you don’t need one at every step. When every sentence announces its relationship to the last, the writing feels mechanical. Sometimes the cleanest transition is no transition, or a simple “But” or “So.”

4. No sentence variety

If you measured your sentences, would they all be 20 to 25 words long? That even pacing is a quiet giveaway. Human writing is bursty—a long, winding sentence followed by a short one. Like this. The fix is to deliberately break a few long sentences in two and let one stand alone.

5. Over-hedging

“It could perhaps be argued that this may possibly suggest a potential correlation.” Stacked qualifiers signal caution, but a wall of them reads as evasive and unnatural. Keep one hedge where you genuinely mean it, drop the rest: “This suggests a correlation.”

A before-and-after walkthrough

Let’s take a paragraph that a student named Mei might write for an environmental science class. Mei’s ideas are solid; her phrasing is doing her no favors.

Before:

> “In today’s modern society, it is important to note that the utilization of plastic materials has experienced a significant increase. Moreover, it can be observed that the disposal of such materials presents the creation of considerable challenges for the management of waste. Furthermore, it could perhaps be argued that the implementation of recycling programs may possibly contribute to a reduction of this problem.”

Three sentences, all the same length, every verb buried in a noun, an empty opener, two stacked transitions, and a chain of hedges. It’s correct. It’s exhausting.

After:

> “Plastic use has risen sharply, and getting rid of all that material is now a real problem for waste management. Recycling programs can help. They won’t solve everything, but they reduce the volume that ends up in landfills.”

Same argument, same register—still no slang, still academic. But verbs do the work (“use,” “getting rid of,” “help,” “reduce”), the empty opener is gone, the transitions disappeared, and the sentences vary: long, short, medium. It sounds like a person who understands the topic and is explaining it to you.

Notice what didn’t happen: Mei didn’t swap in fancier vocabulary. Naturalness came from cutting and re-verbing, not from a thesaurus.

A practical rewriting routine

You don’t need to fix everything in one read. Work in passes—each pass hunts for one habit, which is faster and more thorough than trying to catch all five at once.

1. Read it aloud. This is non-negotiable and it’s free. Your ear catches what your eye skims. Anywhere you stumble or run out of breath, mark it.
2. De-nominalize. Find every “noun + weak verb” combo and turn the noun back into a verb.
3. Cut openers. Delete “It is important to note,” “There is a tendency for,” and similar throat-clearing.
4. Thin the transitions. Keep maybe one in three. Trust the reader to follow.
5. Break the rhythm. Find your longest sentence and split it. Find two short ones near each other and consider joining them. You want unevenness.
6. Read aloud again. If it now sounds like something you’d actually say to a classmate, you’re done.

A small mindset shift helps here: keep your draft history as you edit. If a piece ever gets questioned by a detector, having your versions shows your process. A flag is a probability about word patterns, not proof of who wrote something—OpenAI even retired its own AI classifier in July 2023, citing its low rate of accuracy. Your saved drafts are stronger evidence than any score.

Keep your voice while you fix the rhythm

The biggest risk in “sounding more natural” is overcorrecting into someone else’s voice. Don’t. The goal isn’t to write like a native-born American undergrad; it’s to write clearly like you. Keep your examples, your way of organizing an argument, the specific things you notice. Just unstick the phrasing.

If you use an editing tool to help, treat it as a second ear, not an author. Run a paragraph, see which lines it smooths, then read the result and ask: do I still recognize this? If a tool hands you a word you’d never use, change it back. That keeps the writing honest and keeps it yours.

For more on phrasing, transitions, and what trips detectors, you can browse more of our writing on detection and style, or check the plans if you want to work through longer pieces.

Frequently asked questions

Does sounding more natural mean I have to write informally? No. Natural and casual aren’t the same thing. You can keep a formal academic register—no slang, no jokes—and still sound human. The goal is to remove the stiffness from over-nominalized phrasing, padded openers, and mechanical transitions, not to drop your standards.

Why does my teacher say my grammar is perfect but the writing feels “off”? Because correctness and naturalness are different skills. You can build a flawless sentence no native speaker would phrase that way. The “off” feeling usually comes from textbook word order, every sentence being the same length, or verbs buried inside nouns. Fixing rhythm and phrasing closes the gap.

Will writing more naturally help me avoid being flagged by AI detectors? It can help, though it’s not a guarantee. Detectors estimate how predictable your text is, and over-formal, evenly-paced prose looks statistically similar to machine output. Varied sentence length and concrete phrasing make your writing less uniform. A flag is a probability, not proof.

How do I keep my own voice while rewriting? Rewrite for rhythm and clarity, not for someone else’s words. Read each paragraph aloud and change only the parts you’d never say. Keep your examples and your way of explaining. Thesaurus-swapping reads as forced—a worse problem than stiffness.

Is it cheating to use a tool to make my ESL writing sound more natural? Editing your own ideas for clarity and flow is ordinary writing practice, the same help a native speaker gets from a proofreader. What matters is that the ideas and argument are yours.

Closing

Stiff academic English isn’t a sign your English is weak—it’s usually a sign you learned the cautious, textbook version a little too well. The unlearning is faster than the learning was: cut the openers, free the verbs, vary your rhythm, and read it out loud. Do that for a few essays and it becomes automatic.

When you want a quick read on which lines still sound robotic before you hand something in, run a draft through PaperBleach and fix the flagged sentences in your own words.