English is a grammar patchwork. It inherited noun cases from Germanic languages, verb patterns from Latin through Norman French, articles from nowhere in particular, and a stubbornly rigid word order that native speakers rarely notice until a learner breaks it. For English as a second language learners, the errors that persist longest are almost never the exotic ones. They are the small, structural habits the first language wires in before anyone starts studying English formally.
This guide walks through the grammar errors that appear most often in ESL writing across hundreds of classroom studies and corpus analyses. Each mistake comes with the reason it happens, the rule that fixes it, and examples you can rehearse. The goal is not to memorize a list. The goal is to hear the errors in your own writing before they reach the page.
Why ESL Errors Cluster Around a Few Categories
Second language acquisition research has mapped ESL errors for forty years. The same five or six categories dominate regardless of the learner's first language: articles, verb tense, subject-verb agreement, prepositions, and word order. The reason is simple. These are the features where English behaves differently from almost every other major language, and where the rules have many exceptions.
Learners whose first language has no articles, such as Russian, Japanese, Korean, or Turkish, struggle with "a," "an," and "the" for years after their other grammar has become fluent. Learners whose first language marks verb tense through particles or context, such as Mandarin Chinese or Vietnamese, drop English tense endings or choose the wrong tense under time pressure. Learners whose first language uses flexible word order, such as Russian or Spanish, occasionally produce sentences that sound subtly off because English depends on order more than almost any other major language.
"The errors learners make are not random. They are the fingerprint of their first language pushing against the second. A good teacher can almost always tell a student's native language from three paragraphs of their English writing." Diane Larsen-Freeman, Techniques and Principles in Language Teaching
Knowing this gives you leverage. You can focus your study on the errors your first language is likely to produce rather than grinding through every rule uniformly.
Mistake 1: Article Errors (a, an, the, zero article)
The article system in English has three positions: the indefinite "a" or "an," the definite "the," and the zero article (no article at all). Using them correctly requires knowing whether the noun is countable, whether the reader already knows what you mean, and whether you are talking about a specific instance or a general concept.
Wrong: I went to school by the bus yesterday.
Right: I went to school by bus yesterday.
Wrong: She is a best student in the class.
Right: She is the best student in the class.
Wrong: The honesty is important value.
Right: Honesty is an important value.
The short rules that resolve most article errors:
- Use "a" or "an" when introducing a countable noun for the first time.
- Use "the" when the reader already knows which specific one you mean.
- Use no article when talking about an abstract noun or a plural or uncountable noun in general.
- Use no article with most means of transport after "by" (by bus, by car, by plane).
- Use "the" with superlatives (the best, the tallest, the most important).
| First Language | Typical Article Error | Fix |
|---|---|---|
| Russian, Polish, Czech | Dropping "a" and "the" entirely | Add articles when introducing or specifying a noun |
| Japanese, Korean | Overusing "the" with abstract nouns | Use zero article for concepts like "love," "honesty," "music" in general |
| Spanish, Italian | Adding "the" before plural generic nouns | Say "dogs are loyal" not "the dogs are loyal" |
| Arabic | Omitting "a" or "an" with professions | Say "she is a doctor" not "she is doctor" |
| Mandarin, Cantonese | Using "one" where "a" is needed | Use "a" for first mention: "I saw a car" not "I saw one car" |
Mistake 2: Verb Tense Confusion
English has twelve tense forms once you count the simple, continuous, perfect, and perfect continuous across past, present, and future. Most learners cope with three or four of them and avoid the rest. The result is sentences that sound grammatically flat or that place events at the wrong time.
The most common tense errors cluster around three pairs: simple past vs present perfect, past simple vs past continuous, and future with "will" vs future with "going to."
Wrong: I have seen him yesterday.
Right: I saw him yesterday.
(Present perfect cannot combine with a finished time marker like "yesterday.")
Wrong: When I called her, she cooked dinner.
Right: When I called her, she was cooking dinner.
(Past continuous shows an action in progress when another action interrupts.)
Wrong: I think it will rain. I already see clouds.
Right: I think it is going to rain. I already see clouds.
("Going to" is correct when present evidence points to the future event.)
The rule of thumb that solves most present perfect confusion: use present perfect for actions with a connection to now (unfinished time, repeated actions, recent relevance), and use simple past for actions at a specific finished time.
Mistake 3: Subject-Verb Agreement Errors
The rule is easy to state: singular subjects take singular verbs, plural subjects take plural verbs. The rule is hard to apply because English hides the subject in several ways. Long noun phrases, indefinite pronouns, and collective nouns all trip learners.
Wrong: The list of participants are on the desk.
Right: The list of participants is on the desk.
(The subject is "list," not "participants.")
Wrong: Everyone have their own opinion.
Right: Everyone has their own opinion.
("Everyone" is singular even though it feels plural.)
Wrong: The news are bad today.
Right: The news is bad today.
("News" is always singular despite the s.)
Wrong: Neither the teacher nor the students was ready.
Right: Neither the teacher nor the students were ready.
(With "neither...nor," the verb matches the closer subject.)
For a comprehensive walkthrough, see our full guide on subject-verb agreement.
Mistake 4: Preposition Mistakes
Prepositions are idiomatic. There is no reliable rule for whether you "arrive at" a place or "arrive in" a place, whether you are "married to" or "married with" someone, whether you "depend on" or "depend from" something. You memorize them. Learners whose first language pairs different prepositions with those verbs carry the error for years.
Wrong: I am married with a teacher.
Right: I am married to a teacher.
Wrong: She is good in mathematics.
Right: She is good at mathematics.
Wrong: We arrived to the airport at 8 PM.
Right: We arrived at the airport at 8 PM.
Wrong: I agree with the plan, but I have one comment about it.
Right: I agree with the plan, but I have one comment on it.
Wrong: He was listening the music.
Right: He was listening to the music.
Collect preposition errors in a personal notebook as you find them. Reviewing ten preposition pairs per week for three months corrects more errors than any textbook drill. Prepositions are memorized, not deduced.
Mistake 5: Word Order Errors
English word order is more rigid than most languages. Subject-verb-object is the default, and adjectives come before nouns, not after them. Adverbs of frequency sit between subject and main verb or after the auxiliary verb.
Wrong: I like very much this book.
Right: I like this book very much.
Wrong: She speaks English very good.
Right: She speaks English very well.
(Adverb modifies verb, not noun.)
Wrong: Always I drink coffee in the morning.
Right: I always drink coffee in the morning.
Wrong: He is a man tall.
Right: He is a tall man.
Wrong: Why you are calling me?
Right: Why are you calling me?
(Question word order requires auxiliary before subject.)
Mistake 6: Countable vs Uncountable Nouns
Some nouns are countable in most languages but uncountable in English, or vice versa. The classic offenders include "information," "advice," "furniture," "equipment," "research," and "homework," all of which are uncountable in English and cannot take a plural s or an indefinite article.
Wrong: I need some informations about the course.
Right: I need some information about the course.
Wrong: She gave me many advices.
Right: She gave me a lot of advice.
Wrong: The furnitures in this room are old.
Right: The furniture in this room is old.
Wrong: My teacher assigned us three homeworks.
Right: My teacher assigned us three homework assignments.
To count uncountable nouns, use a counter phrase: "a piece of advice," "a bit of information," "a sheet of paper," "a slice of bread," "a work of research."
Mistake 7: Plural and Possessive Confusion
Apostrophe errors appear in every level of ESL writing and in plenty of native writing as well. The split between plural (dogs), possessive (dog's), and contraction (it's for "it is") stays fuzzy for years.
Wrong: The dog's are barking.
Right: The dogs are barking.
Wrong: Its raining today.
Right: It is raining today. (or "It's raining today.")
Wrong: The students book's are on the floor.
Right: The students' books are on the floor.
Wrong: Whose that man?
Right: Who's that man? (Who is that man?)
"The apostrophe is not decorative. It has a specific job. Putting one before every final s is the most common punctuation error in English and the one that professional editors notice first." Mignon Fogarty, Grammar Girl's Quick and Dirty Tips
Mistake 8: Modal Verb Misuse
Modals (can, could, may, might, must, should, would) do not take an s in third person singular, do not follow with "to" before the main verb, and form questions and negatives differently from regular verbs.
Wrong: She cans speak three languages.
Right: She can speak three languages.
Wrong: I must to finish this report.
Right: I must finish this report.
Wrong: Do you can help me?
Right: Can you help me?
Wrong: He don't can come tomorrow.
Right: He cannot come tomorrow.
Modals also carry subtle meaning distinctions: "should" is advice, "must" is obligation or strong inference, "might" is possibility, "would" is hypothetical or polite. Using the wrong modal can soften a command into a suggestion or turn a possibility into a certainty.
Mistake 9: False Cognates and Direct Translation
Every ESL learner translates from their first language at first. The trap is the word that looks identical to a word in their language but means something different.
| English Word | False Friend in Other Languages | Actual Meaning |
|---|---|---|
| Actually | "actualmente" (Spanish), "actuellement" (French) meaning "currently" | "In reality" or "in fact" |
| Library | "libreria" (Spanish) meaning "bookstore" | A place with free books for borrowing |
| Sensible | "sensible" (Spanish, French) meaning "sensitive" | Practical, showing good judgment |
| Assist | "asistir" (Spanish) meaning "attend" | To help |
| Realize | "realizar" (Spanish) meaning "carry out, achieve" | To become aware of |
| Eventually | "eventualmente" (Spanish) meaning "possibly" | In the end, finally |
| Constipated | "constipado" (Spanish) meaning "having a cold" | Having digestive difficulty |
Translating word by word from your first language also produces phrasings that are grammatically correct but sound foreign. Native English prefers shorter subjects, active verbs, and direct clauses. Sentences that translate directly from Romance languages often carry extra words that native English trims.
Direct translation from Spanish: It is necessary that we make a decision.
Native English: We need to decide.
Direct translation from French: I have made the demand for information.
Native English: I asked for information.
Mistake 10: Overusing "Very" and Weak Adjective Chains
ESL writers often rely on "very" plus a weak adjective where a single strong adjective would do. "Very big" becomes "huge," "very small" becomes "tiny," "very angry" becomes "furious." This habit comes from word-for-word translation where the intensifier in the first language sounds natural but makes English feel vague.
| Weak Phrasing | Stronger Phrasing |
|---|---|
| Very big | Huge, enormous, massive |
| Very small | Tiny, minute, minuscule |
| Very angry | Furious, enraged, livid |
| Very happy | Thrilled, delighted, ecstatic |
| Very tired | Exhausted, drained, spent |
| Very important | Critical, vital, essential |
| Very bad | Terrible, awful, dreadful |
| Very interesting | Fascinating, gripping, compelling |
| Very smart | Brilliant, sharp, astute |
| Very surprised | Stunned, astonished, flabbergasted |
"When you catch an adjective, kill it. No, I don't mean utterly, but kill most of them. Then the rest will be valuable." Mark Twain, letter to D. W. Bowser, 1880
Mistake 11: Pronoun Reference Errors
English pronouns agree with their antecedent in number and gender, and they must be close enough to the antecedent that the reader knows who "he" or "it" refers to.
Wrong: Every student should bring their laptop.
(Traditional) Right: Every student should bring his or her laptop.
(Modern accepted) Right: Every student should bring their laptop.
Wrong: Maria told Sarah that she was late.
(Ambiguous: who was late?)
Right: Maria told Sarah, "You are late."
Or: Maria told Sarah that Sarah was late.
Wrong: When the car hit the tree, it was damaged.
(What was damaged, the car or the tree?)
Right: The car was damaged when it hit the tree.
Mistake 12: Run-On Sentences and Comma Splices
Many languages allow long, chained sentences separated only by commas. English punishes this. Two independent clauses cannot be joined by a comma alone. You need a period, a semicolon, or a comma plus a coordinating conjunction.
Wrong: I finished my homework, I went to bed.
Right: I finished my homework. I went to bed.
Right: I finished my homework, and I went to bed.
Right: I finished my homework; I went to bed.
Wrong: The weather was cold we stayed inside.
Right: The weather was cold, so we stayed inside.
Right: Because the weather was cold, we stayed inside.
For the mechanics of joining clauses correctly, see semicolon usage and complex vs compound sentences.
Mistake 13: Gerund vs Infinitive
Some verbs take a gerund (verb plus -ing) and some take an infinitive (to plus verb). The wrong choice sounds jarring to native ears. Unfortunately there is no single rule. You memorize them, usually in clusters.
Verbs that take gerund: enjoy, finish, avoid, consider, suggest, mind, practice, imagine, admit, deny, quit, keep.
Verbs that take infinitive: want, need, decide, plan, hope, promise, refuse, agree, learn, offer, expect, manage, wish.
Verbs that take either with a shift in meaning: remember, forget, try, stop, regret.
Wrong: I enjoy to swim in the ocean.
Right: I enjoy swimming in the ocean.
Wrong: She decided taking the bus.
Right: She decided to take the bus.
Wrong: I stopped to smoke two years ago. (Means: I paused in order to smoke.)
Right: I stopped smoking two years ago. (Means: I quit smoking.)
"The gerund and infinitive distinction is one of those places where English grammar asks you to carry a list in your head. There is no shortcut. The verbs that take each form were fixed centuries ago and the list is the list." Bryan Garner, Garner's Modern English Usage
Mistake 14: The "Double Negative" Trap
In many languages, piling up negatives intensifies the negation. In English, two negatives cancel each other.
Wrong: I don't know nothing about that.
(In standard English, this logically means "I know something.")
Right: I don't know anything about that.
Right: I know nothing about that.
Wrong: She didn't see nobody at the party.
Right: She didn't see anybody at the party.
Right: She saw nobody at the party.
Some dialects of English use double negatives for emphasis, but these are nonstandard. In academic, professional, or formal writing, one negative is the rule.
Mistake 15: Literal Translation of Idioms and Phrasal Verbs
English uses thousands of phrasal verbs (verb plus particle) whose meanings cannot be guessed from the parts. "Look up" means something different from "look over," "look out," "look into," or "look forward to." Direct translation never works.
Wrong: I looked the word in the dictionary. (Missing particle.)
Right: I looked up the word in the dictionary.
Wrong: Please look my children while I am away.
Right: Please look after my children while I am away.
Wrong: The company made a big success last year.
Right: The company had a big success last year. (Or: The company succeeded last year.)
Wrong: I made a mistake in the test.
Right: I made a mistake on the test.
Phrasal verbs are the single biggest gap between intermediate and advanced ESL learners. A deliberate practice of ten new phrasal verbs per week, used in your own sentences, moves you forward faster than any other study pattern.
Practicing Correction Without Burning Out
The myth of ESL learning is that you must master each error category in sequence. The reality is that errors fade gradually across months of exposure to correct input and feedback on your own output. A student who writes every day and reads every day for a year progresses faster than a student who drills grammar exercises for the same hours.
Some specific practices that accelerate correction:
- Keep a personal error log. When a teacher or editor corrects you, write the original and the correction side by side. Review the log weekly.
- Read aloud from books written for native speakers. The rhythm of correct English settles into your ear in a way that silent reading misses.
- Record yourself speaking for two minutes on a topic, then transcribe what you said. The errors you spot in your own transcript are the ones most worth correcting.
- Write short daily pieces and have a native speaker or a careful proofreader mark only one type of error at a time (articles one week, verb tense the next).
For learners preparing for certification exams, the systematic review at Pass4Sure includes writing assessment practice useful for language portions of professional credentials. For those studying the cognitive side of language learning, research summaries at What's Your IQ explain why spaced repetition and retrieval practice consistently outperform rereading.
Cross-Linguistic Patterns in Error Persistence
Not all ESL errors fade at the same rate. Researchers have mapped which errors tend to persist into very advanced proficiency and which disappear once learners reach intermediate levels.
Errors that fade fastest: basic word order, simple past tense, straightforward plurals.
Errors that persist into advanced levels: article usage, preposition choice, verb-gerund-infinitive pairings, subtle register differences, phrasal verb use.
This is why a speaker who sounds near-native on most dimensions can still be identified as non-native by a few lingering signals, usually a missing article or a prepositional idiom that went sideways. These are the last fortresses to fall.
"The student's accent is the last thing native listeners notice. The student's article errors are the last thing to disappear. Between those two, everything else corrects itself with enough practice." Rod Ellis, The Study of Second Language Acquisition
For writing practice that stretches across many formats, see our guides on transition words, passive voice, and who vs whom. And for those using writing platforms to host their own portfolios while learning, the documentation tools at File Converter Free make it easy to convert drafts across PDF, Word, and Markdown for feedback cycles.
Turning Corrections Into Confidence
The hardest part of ESL learning is not memorizing rules. It is building the confidence to write and speak while you still make mistakes. The students who progress fastest are the ones who accept error as part of the process and keep producing language every day. Fluency does not come from perfection. It comes from volume.
Every error corrected is a piece of the structure becoming permanent. A learner who has corrected her article errors two hundred times stops making them, not because she memorized a rule but because the pattern wore a groove in her brain. Persistence is the curriculum.
References
Larsen-Freeman, D., and Anderson, M. (2011). Techniques and Principles in Language Teaching. Oxford University Press. https://global.oup.com/academic/product/techniques-and-principles-in-language-teaching
Ellis, R. (2008). The Study of Second Language Acquisition (2nd ed.). Oxford University Press. https://doi.org/10.1017/S0272263109090019
Swan, M., and Smith, B. (2001). Learner English: A Teacher's Guide to Interference and Other Problems (2nd ed.). Cambridge University Press. https://www.cambridge.org/elt
Garner, B. A. (2022). Garner's Modern English Usage (5th ed.). Oxford University Press. https://www.oup.com/academic
Fogarty, M. (2008). Grammar Girl's Quick and Dirty Tips for Better Writing. Holt Paperbacks. https://www.quickanddirtytips.com/grammar-girl
Biber, D., Johansson, S., Leech, G., Conrad, S., and Finegan, E. (1999). Longman Grammar of Spoken and Written English. Longman. https://www.pearson.com/
Cambridge English Corpus. Common Errors in English Usage Database. https://www.cambridge.org/elt/blog/
British Council Learn English. Common ESL Grammar Errors by First Language. https://learnenglish.britishcouncil.org/
Frequently Asked Questions
What are the most persistent grammar errors for ESL learners?
Articles (a, an, the), preposition choice, and verb-gerund-infinitive pairings persist longest. These three categories often remain visible even in advanced learners because English has few consistent rules for them. Most other errors fade more quickly with practice.
How long does it take to stop making article errors in English?
For learners whose first language has no articles, consistent article use typically takes two to four years of regular English exposure and writing practice. The rules are memorable in an afternoon, but the reflex takes years to build.
Why do ESL learners confuse present perfect and simple past?
Many first languages either lack a perfect tense entirely or use it differently than English. English requires present perfect for actions connected to now and simple past for finished time periods, a distinction that feels arbitrary until learners see enough examples in context.
Are phrasal verbs really necessary for fluent English?
Yes. Native English uses thousands of phrasal verbs, and avoiding them makes writing sound stilted. Intermediate learners who focus on ten phrasal verbs per week typically reach advanced fluency faster than those who stick to Latin-derived single verbs.
What is the best way to correct my own grammar errors?
Keep a personal error log where you record the original mistake alongside the correction. Review weekly. Focus on one error category at a time rather than trying to fix everything at once. This is slower but produces lasting change.
Is it acceptable to use 'they' as a singular pronoun in ESL writing?
Yes. Singular 'they' is now accepted by the Associated Press Stylebook, Chicago Manual of Style, and most major dictionaries. It resolves the awkward 'his or her' construction and is standard in both professional and academic English.
Why do my translations from my first language sound wrong even when the grammar is correct?
Every language has natural phrasing patterns that differ from grammar rules. English tends toward short subjects, active verbs, and direct clauses. Word-for-word translation produces technically correct sentences that feel foreign because the rhythm and phrasing patterns do not match native English.