The one that costs the most: the endings you cannot say
Vietnamese syllables are strictly limited at the end. There are no final consonant clusters at all, and the final stops that do exist are unreleased — the mouth closes and the sound simply stops.
English hangs its entire grammatical system on that exact position:
| English word | Ends in | What it carries |
|---|---|---|
| walked | /kt/ — a cluster | past tense |
| works | /ks/ — a cluster | third person singular |
| students | /ts/ — a cluster | plural |
| asked | /skt/ — three consonants | past tense |
- She work at a bank. → She works at a bank.
- Yesterday I walk home. → Yesterday I walked home.
- Many student come. → Many students come.
- I have finish my homework. → I have finished my homework.
Practise these out loud, and release the final consonant. Exaggerate it. Walk-T. Work-S. Ask-T. It will feel unnatural, because in Vietnamese it is. That feeling is the sign you are doing it correctly, and this single habit is worth more than everything else on this page.
Tense: Vietnamese marks it with words, English with the verb
Vietnamese verbs never change. Time is carried by separate words — đã (past), đang (progressive), sẽ (future) — and once the time is established, it is not repeated.
So English feels redundant: the sentence already says yesterday, so why change go to went? Because English requires both, and leaving the verb unchanged is a grammar error, not a stylistic choice.
- Yesterday I go to school. → Yesterday I went to school.
- Last year she study English. → Last year she studied English.
- Tomorrow I will going. → Tomorrow I will go.
- When I was young, I am playing football. → When I was young, I played football.
And because Vietnamese does not repeat the time marker, English tense within a sequence is a specific weakness. If the paragraph is in the past, every verb in it must be in the past.
The missing 'be'
In Vietnamese an adjective can be the predicate on its own — Cô ấy đẹp is complete without a verb. English always needs one.
- She very beautiful. → She is very beautiful.
- The weather very hot today. → The weather is very hot today.
- I very tired. → I am very tired.
- This problem very serious. → This problem is very serious.
Note also that rất (very) is common in Vietnamese and very is not required in English. She is beautiful is complete and natural. If you want emphasis, choose a stronger adjective — stunning, gorgeous — rather than adding very, which the vocabulary criterion treats as imprecise.
Structures that transfer badly
1. 'Although… but…'
Vietnamese uses paired connectors — tuy… nhưng…, vì… nên…. English allows only one.
- Although he is rich, but he is unhappy. → Although he is rich, he is unhappy.
- Because it rained, so we stayed home. → Because it rained, we stayed home.
2. Relative clauses
Vietnamese has no relative pronouns, so the joining word goes missing, and the object pronoun often stays.
- The book I read it was interesting. → The book (that) I read was interesting. — the relative pronoun is the object, so it must go.
- The man he is standing there is my teacher. → The man who is standing there is my teacher.
3. Question word order
- You go where? → Where do you go? / Where are you going?
- Do you know where is the station? → Do you know where the station is? (no inversion inside an embedded question)
4. Plurals and countability
- two book → two books (English marks plural on the noun; Vietnamese uses classifiers)
- informations, advices, equipments → information, advice, equipment — uncountable
Tone, and why English sounds flat
Vietnamese is tonal: pitch distinguishes words. Ma, má, mà, mả, mã, mạ are six different words, and pitch is doing lexical work at the level of the syllable.
English uses pitch completely differently — across the whole sentence, to carry meaning and attitude. Falling at the end of a statement. Rising for a question. Leaning on the important word.
Transferring a syllable-level tone system to a sentence-level intonation system tends to produce speech with a narrow, flat pitch range, which listeners find hard to follow even when every sound is correct — and which pronunciation criteria penalise, because they explicitly ask whether intonation conveys meaning.
Smaller errors worth fixing
| Instead of | Write |
|---|---|
| I very like it. | I really like it. / I like it a lot. |
| I am agree. | I agree. |
| It depend of… | It depends on… |
| I go to home. | I go home. (no preposition) |
| He is my same age. | He is the same age as me. |
| I am boring. | I am bored. |
| Everyone have… | Everyone has… (everyone is singular) |
| In my country have many festivals. | There are many festivals in my country. |
Articles — last, on purpose
Vietnamese has no articles, so a and the will take years. This is normal, and it is not what is capping your band.
Learn one rule now, because it changes your meaning: general statements take no article (Children need exercise); specific ones take the (The children in my class need exercise).
Then go back to the final consonants. For a Vietnamese speaker, that is where the marks are — and it is a physical habit you can build in weeks.
Frequently asked questions
What is the biggest English mistake Vietnamese speakers make?
Deleting the final consonants that carry English grammar. Vietnamese permits no final consonant clusters and its final stops are unreleased, so the /kt/ in 'walked' and the /ks/ in 'works' are physically foreign — and English hangs its past tense, plurals and agreement on exactly that position. It is a pronunciation problem that produces a grammar error, and it costs you on two criteria at once, in nearly every sentence.
How do I fix dropped -ed and -s endings?
Say them out loud and deliberately release the final consonant, exaggerating it: walk-T, work-S, ask-T. It will feel unnatural, because in Vietnamese it is — and that feeling is the sign you are doing it right. Reading them silently changes nothing; this is a physical habit rather than a knowledge problem, and it is worth more than any other single fix available to you.
Why do I forget 'is' and 'are' in English?
Because in Vietnamese an adjective can be the whole predicate — 'Cô ấy đẹp' is a complete sentence with no verb in it. English always needs one, so 'she very beautiful' must become 'she is very beautiful'. Watch for it particularly with adjectives, where the missing verb is easiest to overlook.
Can I say 'Although... but...' in English?
No. Vietnamese uses paired connectors like 'tuy... nhưng...' and 'vì... nên...', but English allows only one: write either 'Although he is rich, he is unhappy' or 'He is rich, but he is unhappy'. The same applies to because and so — never both.
Why does my English sound flat?
Because Vietnamese is tonal, using pitch to distinguish individual words, while English uses pitch across the whole sentence to carry meaning and attitude. Transferring a syllable-level tone system to a sentence-level intonation system tends to produce a narrow, flat pitch range, which listeners find hard to follow even when every sound is correct. Shadowing the melody of natural English fixes it, and it requires no new sounds at all.