ESL College Essay: Which Grammar Mistakes Matter

ESL College Essay: Which Grammar Mistakes Matter

Clarity is the test, not perfect grammar. UC says applicants "will not be evaluated on grammar, spelling or sentence structure." Fix every error that changes your meaning. Leave the occasional missing article. And do not polish the essay past your own English.

If you came here asking how to make your essay sound more native, our view is that polish is the bigger risk. A missing "the" costs you nothing a reader cares about. A voice that suddenly sounds like a 40-year-old editor puts your essay out of line with Harvard's rule that it "should reflect their own content, writing style, and English proficiency", and with every other sample of your English a college can see. This page sorts errors into fix, cheap fix and leave, with a constructed paragraph marked line by line. When you are done, a Common App essay review reads the draft for story, not commas.

Every college page quoted below was checked on October 30, 2026. Only Caltech's page names a cycle (Fall 2027); the others state no year.

What colleges say about English in your essay

Read across the five and one rule appears: errors matter when they block meaning, and help is allowed when it fixes errors without replacing your sentences. No college we checked publishes a rule that small errors lower an essay's rating.

Fix these: errors that change meaning

These are the errors that make a reader misunderstand what happened. Fix every one.

• Tense that moves the time. "Last month I am still going to the lab" leaves the reader unsure whether you still go. Check every verb in a sentence that has a time word.
• Pronouns with no clear owner. If your first language does not mark "he" and "she" differently, or drops pronouns, check each one. Ask: who is "she" here?
• Words that flip meaning. "He was a hardly working person" means he barely worked. "Hard-working" is the opposite. Other flips to check: "sensible" and "sensitive", "actual" and "current", "eventually" and "possibly".
• False friends. A loanword can mean something else in English. In Japanese, manshon is an apartment building; "my family's mansion" tells a US reader you are rich. In Korean and Japanese schools, a senior (sunbae, senpai) is an older student or colleague; a US reader hears a twelfth-grader.
• Missing logic words. "I failed the exam. I joined the team." Did one cause the other? Add "so", "because" or "after" where the link matters.

Cheap fixes: errors a spellchecker catches

Wrong past tenses ("teached"), plurals of uncountable nouns ("advices", "informations"), missing verbs ("I do not angry") and typos. They rarely block meaning, but they take seconds to fix. Caltech treats a grammar and spelling check "of your completed essays" as ethical. So draft first, then run the check, then decide on each suggestion yourself.

Leave these: errors that don't cost meaning

• An occasional missing or extra "a" or "the".
• A preposition that is slightly off ("interested about", "discuss about").
• Simple vocabulary. "Big problem" is fine. You don't need "formidable obstacle".
• Short sentences and a non-native rhythm. That is your writing style, which Harvard says the essay should reflect.

The countercase: if you are applying where the English requirement is high and the essay is your strongest writing sample, clean up the leave-list too, as long as the sentences stay yours. Columbia, for example, asks applicants to be "comfortable with rapid and idiomatic spoken English." Fixing articles yourself is still your English. Having someone rewrite the sentence is not.

Constructed example: one paragraph, marked

Constructed example, written by us, not a real applicant statement. The draft:

When I was in the middle school, my senior in the robotics club teached me how to solder. He was very hardly working person. Every day after class we stayed at the lab until nine o'clock. Last month I am still going to the lab, but now I am teaching the first-year students. Sometimes she makes mistake and burns the board. I do not angry. I tell her what my senior told me: the board is cheap, but your finger is not.

Word count: 82. The errors, sorted:

The fixed version, with the leave-list left alone. Constructed example, written by us, not a real applicant statement.

When I was in the middle school, an older student in the robotics club taught me how to solder. He was a very hard-working person. Every day after class we stayed at the lab until nine o'clock. I still go to the lab, but now I teach the first-year students. Sometimes one of them, Ji-woo, makes mistake and burns the board. I am not angry. I tell her what he told me: the board is cheap, but your finger is not.

Word count: 81. Every sentence is still the student's. The last line, the best one in the paragraph, survives.

The over-polished version, the one to avoid. Constructed example, written by us, not a real applicant statement.

During my formative middle school years, a seasoned upperclassman in our robotics society generously imparted the delicate art of soldering. His unwavering work ethic was nothing short of inspirational. Today, I have the privilege of paying that mentorship forward to a new generation of aspiring engineers, and I respond to their inevitable missteps with patience, reminding them that components are replaceable, but their safety is paramount.

Word count: 66. It is shorter and error-free, and it no longer sounds like a teenager, let alone this one. The Ji-woo scene is gone, and "your finger is not" became "their safety is paramount."

Why "sound more native" backfires

Colleges can see your English in places no editor touches. Columbia says applicants "can elect to send InitialView or Vericant videos to emphasize language fluency" (Columbia), and Boston University notes that the Duolingo English Test "combines an English proficiency test with a brief video interview" (BU). The full list of these samples, with each college's wording, is in what to do if an agent wrote your college essay.

Neither college says it compares those videos with your essay. But a reader who has heard you speak unscripted and then reads a native-polished essay from you can notice the gap. Under Harvard's rule, the essay is supposed to match your English, not exceed it. For how each piece of English evidence fits together, see does your essay need to match your English test. For the interview services, see InitialView vs Vericant. If someone else's polish has already replaced your sentences, that same page covers taking the essay back.

An ESL self-edit checklist

1. Finish the whole draft before you fix anything.
2. Underline every time word ("last month", "now", "since"). Check the verb next to it.
3. Circle every "he", "she", "it" and "they". Point to who each one is.
4. Check each loanword and school term from your own country against an English dictionary.
5. Run a grammar and spelling check. Accept a change only if you would have written it yourself.
6. Read the essay aloud. Mark any sentence you would not say. Rewrite it in your own words.
7. Ask one person to mark errors, not rewrite them. Cornell allows that check; it does not allow a rewrite.
8. Compare the essay with something you wrote alone, like a school paper. They should sound like the same writer.

If a classmate reads your draft, use a peer review checklist for college essays that keeps grammar for last.

If your draft is correct but stiff, the problem is register, not grammar: see how to fix a college essay that sounds too formal. If you drafted in your first language, read writing your essay in your first language, then translating before you go further.

Questions about grammar in college essays

Is it OK if my college essay has small grammar mistakes?

UC says applicants will not be evaluated on grammar, spelling or sentence structure, as long as the writing is clear. None of the other colleges we checked publishes a rule on small errors. Fix errors that change meaning and leave the rest.

Can a teacher or tutor correct my grammar?

Cornell lists a grammar check by a friend or family member as acceptable, and Caltech lists AI grammar review of a completed essay as ethical. Cornell lists "Having any person write or rewrite your essays/responses" as unacceptable. So a person can mark errors; you make the fixes.

How do I make my college essay sound more native?

Don't aim for that. Aim for clear. Harvard says the essay should reflect your own English proficiency. Use the fix list above, then stop.

Should I explain in the essay that English is my second language?

Not as an apology. If English is part of your story, that is a topic, and our guide to the college essay about learning English shows three angles. The application already shows your schooling and test results. Your teacher can show your English growth directly; send them the teacher recommendation guide for ESL students.

Get a free review of your Common App essay

Get a free Quick Review of your Common App essay against GradPilot's narrative craft rubric. It reads whether the essay is built on one main moment, stays inside the scene, uses details that change the story, and lets the meaning grow before the moral. If your essay is about your background or language, use the background and identity rubric. For a short supplement answer, use the personal short answer rubric.

More guides on English and voice:

• Does your college essay still sound like you?: five signs an edit has replaced your voice.
• How colleges treat grammar checkers: what published AI policies say about grammar tools.
• UC English proficiency: TOEFL, IELTS and Duolingo: UC's test rules for international applicants.

Sources

Retrieved October 30, 2026, except where noted.

• University of California, Personal insight questions (the page states no year): grammar, spelling and clarity instruction.
• Harvard College, What help can students receive in writing their essays? (undated FAQ): "own content, writing style, and English proficiency".
• Harvard College, International Applicants (undated): "express thoughts quickly and clearly".
• Columbia Undergraduate Admissions, English Proficiency Requirements and International Applicants (undated): "rapid and idiomatic spoken English"; may contact applicants; InitialView or Vericant videos.
• Caltech Undergraduate Admissions, AI Policy: Guidelines for Fall Applicants (Fall 2027): grammar and spelling review of completed essays listed as ethical.
• Cornell University Undergraduate Admissions, Receiving Help with Your Application (no cycle stated): grammar check acceptable; rewriting unacceptable.
• Boston University Admissions, International Applicants (undated): Duolingo English Test video interview.