The endings: the most expensive error you can make
Thai allows only a small set of final consonants, they are all unreleased, and Thai permits no final clusters at all. English, meanwhile, puts its entire grammatical system at the end of the syllable.
Worse, Thai does not merely drop the ending — it substitutes it. Final /l/ becomes /n/, final /s/ is not permitted, and consonant clusters are simplified. So the ending does not just go quiet; it changes into something else.
| English | What it carries | What often comes out |
|---|---|---|
| works | third person singular | work — the /ks/ cluster is not possible |
| walked | past tense | walk — the /kt/ cluster is not possible |
| students | plural | studen |
| school | — | schoon — final /l/ becomes /n/ |
- She work at a hotel. → She works at a hotel.
- Yesterday I go to Bangkok. → Yesterday I went to Bangkok.
- I have live here five year. → I have lived here for five years.
Practise these out loud and release the final consonant, exaggerating it. Work-S. Walk-T. It will feel wrong, because in Thai it is impossible. That feeling is the point, and this single habit is worth more than everything else on this page.
The missing 'is'
In Thai, an adjective works like a verb — สวย (suay) already means is beautiful. There is no separate word for is, and adding one feels redundant.
- She beautiful. → She is beautiful.
- The weather very hot. → The weather is very hot.
- I very tired. → I am very tired.
- This food delicious. → This food is delicious.
Note also that มาก (very) is common in Thai and very is not needed in English. She is beautiful is a complete, natural sentence — and the vocabulary criterion treats very + a vague adjective as imprecise. Use a stronger word instead: stunning, exhausted, delicious already contains very.
Tense: Thai uses words, English changes the verb
Thai verbs never change form. Time is carried by separate markers — แล้ว (completed), จะ (future), กำลัง (in progress) — and once time is established, it is not repeated.
So English feels wasteful: the sentence already says yesterday, so why change go into went? Because English requires both, and an unchanged verb is a grammar error rather than a stylistic choice.
- Yesterday I go to the temple. → Yesterday I went to the temple.
- Last year she study in England. → Last year she studied in England.
- Tomorrow I will going. → Tomorrow I will go.
- When I am child, I live in Chiang Mai. → When I was a child, I lived in Chiang Mai.
And because Thai does not repeat the marker, tense across a sequence is a specific weakness. If your paragraph is in the past, every verb in it must be in the past.
Punctuation is a system you have never used
Thai writing does not put spaces between words — it puts them between clauses and sentences. There is no full stop, and no comma as English uses one.
So English punctuation is not a set of rules you keep forgetting. It is an entire system your first language does not have, and it has to be learned deliberately.
- Every sentence ends with a full stop, and the next one starts with a capital letter.
- A comma cannot join two sentences. I went to the market, I bought fruit. is an error — use a full stop, or and, or because.
- Capitals on: names, countries (Thailand), languages and nationalities (Thai), days (Monday), months (April), and the pronoun I, always.
Structures that transfer badly
| Instead of | Write |
|---|---|
| I very like it. | I really like it. / I like it a lot. |
| Same same. | They are the same. / It's similar. |
| I go to home. | I go home. (no preposition) |
| You go where? | Where do you go? / Where are you going? |
| You like it or not? | Do you like it? (Thai ไหม / หรือไม่ becomes a tag; English uses inversion) |
| Do you know where is the hotel? | Do you know where the hotel is? (no inversion inside an embedded question) |
| two book, many student | two books, many students (English marks plural on the noun) |
| informations, advices | information, advice — uncountable |
| I am boring. | I am bored. |
| In Thailand have many temples. | There are many temples in Thailand. |
| Although it rained, but we went. | Although it rained, we went. (one connector only) |
Tone, and why English sounds flat
Thai is tonal: pitch distinguishes words, and the five tones do lexical work at the level of the syllable. English uses pitch completely differently — across the whole sentence, to carry meaning, emphasis and attitude.
Transferring a syllable-level tone system to a sentence-level intonation system tends to produce a narrow, flat pitch range in English, which listeners find effortful to follow even when every individual sound is correct. Pronunciation criteria explicitly ask whether intonation conveys meaning, so this is scored.
Articles — last, on purpose
Thai has no articles, so a and the will take years to feel natural. That is normal, and it is not what is capping your band.
Learn one rule now, because it changes what you are claiming: 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 and the full stops. For a Thai speaker, that is where the marks actually are — and both are habits you can build in weeks rather than years.
Frequently asked questions
What is the biggest English mistake Thai speakers make?
Losing the final consonants that carry English grammar. Thai allows only a small set of unreleased final consonants and no final clusters at all, so the /ks/ in 'works' and the /kt/ in 'walked' are impossible — and English hangs its tense, plurals and agreement on exactly that position. It is a pronunciation problem that produces a grammar error, so it costs you on two criteria at once, in nearly every sentence.
Why do I forget 'is' in English sentences?
Because in Thai an adjective already works like a verb — สวย means 'is beautiful' on its own, so adding a separate word for 'is' feels redundant. English always needs a verb, so 'she beautiful' must become 'she is beautiful'. Watch for it especially with adjectives, where the missing verb is easiest to overlook.
Why is English punctuation so hard for Thai speakers?
Because Thai does not put spaces between words — it puts them between clauses — and has no full stop or comma as English uses them. So English punctuation is not a rule you keep forgetting; it is an entire system your first language does not have. It is worth an hour of deliberate study, because punctuation sits inside the grammar criterion and missing full stops across a whole essay count as a systematic error.
Why does my English sound flat?
Because Thai is tonal, using pitch to distinguish individual words, while English uses pitch across a whole sentence to carry meaning and emphasis. Transferring a syllable-level tone system to a sentence-level intonation system produces a narrow, flat pitch range that listeners find effortful, even when every sound is correct. Shadowing the melody of natural English fixes it, and it requires no new sounds at all.
Should Thai learners study articles first?
No. Thai has no articles, so 'a' and 'the' will take years — that is normal rather than a failing, and it is not what is capping your band. Learn one distinction now (general statements take no article; specific ones take 'the'), then spend the time on your final consonants and your full stops, which are where the marks actually are.