Greek and Mediterranean-Language Writers: Punctuation Habits That Read as AI

You wrote the essay yourself, in your second or third language, and it still came back flagged as machine-made. If you grew up writing in Greek, Italian, Spanish, Portuguese, or French, that flag may have less to do with your ideas than with your commas. Search “greek esl writers ai detection” and you’ll find plenty of alarm and very little explanation of why it keeps happening to careful, honest writers.

The short version: the long, comma-chained sentence that is normal and even elegant in Greek and its Mediterranean neighbors produces an even, low-variation rhythm in English, and that flat rhythm is one of the main signals AI detectors key on.

This isn’t about mistakes. Your grammar can be flawless. It’s about a way of building sentences that transfers from your first language and happens to look, statistically, a lot like what a language model produces.

Key takeaways

• Greek and several Mediterranean languages favor long, flowing sentences held together by commas and other soft joints, and that habit carries straight into English.
• Long, uniform sentences flatten your burstiness, the amount your sentence length varies, and detectors read low burstiness as machine-like even when the writing is fully your own.
• The fix isn’t shorter writing everywhere. It’s varied writing: mix long sentences with short ones on purpose.
• Break your longest comma chains into two or three sentences, and use semicolons where they earn their place instead of as a default joint.
• A detector flag is a probability, not proof. Keep your drafts and version history so you can show the work is yours.

Greek ESL writers and AI detection: it starts with punctuation

Formal writing in Greek has a long tradition of the periodic sentence, the *periodos*, where a main idea is developed across several subordinate clauses before it resolves. That structure is taught, admired, and rewarded. A sentence that unfolds and keeps unfolding, holding several thoughts in the air at once, reads as controlled and educated.

Other Mediterranean languages lean the same way. Italian, Spanish, Portuguese, and French all tolerate longer sentences with more embedded clauses than modern English style prefers, and they let commas do work that English hands to the full stop. What English marks as a comma splice is, in those traditions, often just normal connected prose.

When you write English, that instinct comes with you. You build a sentence, and instead of stopping, you add a clause, then a comma, then another, because that is what good writing felt like in your first language. The English stays grammatical or nearly so. But the shape is imported, and the shape is what a detector reads.

The specific habits that transfer

A few patterns show up again and again in English written by Mediterranean-language speakers:

• Comma chains. Three, four, or five clauses joined by commas into one long sentence, where an English writer would have used two or three separate sentences.
• Uniform length. Not one runaway sentence, but a whole paragraph of similar long ones, each carrying about the same load.
• Soft joints over hard stops. A preference for commas, semicolons, and dashes to keep a thought going, rather than ending it and starting fresh.

There’s a Greek-specific twist worth knowing. In Greek, the mark that looks like a semicolon, the ;, is actually the question mark, and a raised dot called the *ano teleia* does the semicolon’s job. So a Greek writer’s relationship with the English semicolon is learned from scratch, and some lean on it hard, using it as a comfortable way to bolt clauses together. That’s not wrong. But a page of semicolon-joined long sentences has very little rhythm variation, and that’s the part that matters here.

Why uniform long sentences flatten burstiness

AI detectors mostly measure two things. One is perplexity: how surprising each next word is, given the words before it. The other is burstiness: how much your sentence length and rhythm vary across the text. You can read the full breakdown in our piece on perplexity and burstiness, but the short version is what counts here.

Human writing, in its natural state, is bursty. People write a long, winding sentence and then a short one. They vary. Language models, left to their defaults, produce text that is smooth and even, sentence after sentence landing in the same middle range. Low burstiness is one of the clearest signatures of generated text.

Here’s the trap. When your L1 pushes you toward long, comma-chained sentences of similar weight, your burstiness drops for a completely different reason. You’re not a machine. You’re carrying a style. But the number the detector sees looks the same either way. It reads the flatness, not the reason for it, and it guesses AI.

This is also why detectors are known to misfire on non-native writers in general. A 2023 study by Liang and colleagues, published in *Patterns*, found that several detectors flagged writing by non-native English speakers far more often than writing by native speakers, partly because that writing uses a narrower band of common words and less varied structure. It’s worth remembering, too, that OpenAI retired its own AI text classifier in July 2023 for low accuracy. These tools estimate. They don’t know.

Concrete fixes that keep your voice

You don’t have to write like a different person. You have to break the flat rhythm, and most of that comes down to a few habits.

Vary sentence length on purpose

This is the highest-leverage change. Read a paragraph and notice if every sentence runs long and similar. If it does, split two of them, fold two others into one, and add a short, blunt sentence to land the point. Like this one. That deliberate unevenness is burstiness, and it’s genuinely hard to fake with a template.

You can do most of this without changing your vocabulary or your argument. You’re editing the rhythm, not the ideas.

Break the longest comma chains

Find the sentence in each paragraph that is doing the most work, the one strung together by commas. Then ask where an English reader would take a breath. Put a full stop there.

• Chained: *The results were promising, though the sample was small, and the authors noted this limitation, which suggests the findings should be read with caution.*
• Broken: *The results were promising. The sample was small, though, and the authors said so. Read the findings with caution.*

Same meaning, same register. The second version simply stops more often, and stopping is what English does.

Let the semicolon earn its place

A semicolon between two closely related independent clauses is good English. The problem is using it as a default joint to keep a sentence alive past its natural end. If you’re reaching for one because a full stop feels too abrupt, that feeling is often the L1 talking. Try the full stop instead. Keep the semicolon only where the two halves genuinely belong in one breath.

Add detail only you could write

Even, generic sentences are predictable. Specific ones aren’t. Name the study, the figure, the counter-example from your own reading. A concrete detail breaks the smooth surface a detector keys on, and it reads as more competent to a human at the same time.

A flag is a probability, not proof

If a detector rates your essay as likely AI, that is a guess with a known bias against writers exactly like you. It is not evidence, and it is not a verdict. Non-native writers get false positives at higher rates, and no serious tool claims otherwise.

So protect yourself. Keep your drafts, your notes, and any version history that shows the writing grew over time. If your work is ever questioned, that trail is worth far more than any score. Treat the detector as a mirror for your rhythm, not a judge of your honesty.

Frequently Asked Questions

Why does my grammatically correct English still get flagged as AI? Most detectors don’t grade grammar. They estimate how predictable your word choices are (perplexity) and how much your sentence length varies (burstiness). If your first language pushes you toward long, evenly paced sentences held together by commas, your English can end up with very little rhythm variation. That flatness overlaps with what language models produce, so a detector can rate it high-probability AI even though you wrote every word. A 2023 study by Liang and colleagues found detectors flagged non-native English writing as AI far more often than native writing, which is exactly this problem.

Is it the semicolons specifically that set off the detector? No single punctuation mark flips a detector one way or the other. A semicolon isn’t a red flag on its own. What matters is the overall pattern: if semicolons and commas are letting you run clause after clause into long, similar-length sentences, the result is low burstiness across the whole piece. Change the rhythm, not just the punctuation, and the pattern breaks. Used occasionally, a semicolon between two related independent clauses is perfectly good English and won’t hurt you.

I’m Greek, Italian, or Spanish. Do detectors really bias against non-native writers? There is evidence they do. The Liang 2023 study in Patterns ran essays by non-native English speakers through several detectors and found sharply higher false-positive rates than for native writers, partly because non-native prose tends to use a narrower band of common words and less varied structure. That doesn’t mean every detector fails every time, but it does mean a flag on your writing is far from conclusive, and you’re right to be skeptical of it.

If I chop my long sentences into short ones, won’t my writing lose its style? The goal isn’t short writing, it’s varied writing. Keep some of your long, well-built sentences; they can be a strength. Just don’t let every sentence run the same length. Mix in shorter ones, break the longest comma chains into two, and let the rhythm move. That variety reads as more confident to a human reader and as less predictable to a detector, and it keeps the voice that makes your writing yours.

What’s the fastest single change I can make? Find your longest comma-chained sentence and split it into two or three. Most drafts from Mediterranean-language writers have a few sentences doing far too much work, joined by commas where English would use a full stop. Breaking the biggest one raises your sentence-length variation immediately, reads more clearly, and is hard to reproduce with a formula. Do that two or three times across the piece and the even rhythm is already gone.

The point isn’t the score

Your long, layered sentences are not a flaw. They’re a habit worth keeping in moderation, and a real part of how you think on the page. The change you’re making is small: let the rhythm breathe, stop more often than your first language would, and vary the length so the writing moves the way English moves. Do that because it reads better, and the detector problem mostly fades on its own.

When you want a second opinion before you hand a draft in, you can check a draft and humanize it to find the sentences a detector still rates as flat, then fix only those. If you’re weighing how often you’ll use it, you can see which plan fits, or browse more guides on writing and detection to keep sharpening the habit.