Grammar Checker for Vietnamese Speakers
L1-aware grammar, paraphrasing, and translation tuned to the specific transfer patterns Vietnamese speakers face when writing English — from academic abstracts to business correspondence.
What makes English harder for Vietnamese speakers?
English writing problems for Vietnamese speakers cluster around one deep difference — Vietnamese has no inflection at all, so English tense, plural -s, articles, and the verb «be» before adjectives are systematically dropped.
Vietnamese is an isolating language: words never change form. Time is carried by particles — «đã» for past, «đang» for ongoing, «sẽ» for future — not by the verb, so a writer produces «Last year we collect the data» instead of «collected». Number works the same way: nouns take no plural ending, so «three result» and «many sample» appear for «three results» and «many samples». The grammatical information English packs into word endings is, in Vietnamese, either a separate particle or left to context.
The second cluster is the function words English requires and Vietnamese does not. Vietnamese has no articles, so «We measured temperature of sample» drops the «the»s English needs; and Vietnamese adjectives are themselves stative verbs, so no copula appears before them — «The result very significant» stands in for «The result is very significant». Subjects and expletive «it/there» also drop, giving «Is important to note...» for «It is important to note...».
Diglot's Grammar Checker is tuned for these Vietnamese → English patterns specifically — missing past-tense inflection, missing plural -s, dropped articles, the zero copula before adjectives, and dropped subjects. It names the Vietnamese-L1 reason — an isolating grammar with no inflection — behind each correction rather than treating it as an isolated slip.
What Grammar Checker specifically does for Vietnamese writers
A Vietnamese-aware grammar checker holds the no-inflection pattern open while reading the English output. Because Vietnamese marks tense and number with particles or context rather than word endings, a writer produces «Last year we collect three result» where English needs «Last year we collected three results». An English-only checker may not register that the base-form verb and the singular noun are systematic, not accidental. Diglot supplies the past tense and the plural -s and names the Vietnamese source — an isolating grammar where verbs and nouns never change shape.
The other Vietnamese patterns the checker is built around are the function words English requires and Vietnamese omits: the articles missing from «temperature of sample», the copula missing from «The result very significant», and the dropped subject in «Is important to note...». Diglot inserts «the», «is», and the expletive «It», flagging each as Vietnamese-L1 transfer rather than as careless omission — which is why it keeps catching them across a methods or results section.
Top Vietnamese-to-English transfer patterns Diglot catches
| Pattern | Example error | Corrected |
|---|---|---|
| Missing past-tense inflection | "Last year we collect the data." | "Last year we collected the data." |
| Missing plural -s | "We ran three experiment." | "We ran three experiments." |
| Dropped article | "We measured temperature of sample." | "We measured the temperature of the sample." |
| Zero copula before adjective | "The result very significant." | "The result is very significant." |
| Dropped subject / expletive | "Is important to note this limitation." | "It is important to note this limitation." |
Ready to write better English?
Diglot combines L1-aware grammar checking, paraphrasing, translation, and originality verification in one workspace — built for Vietnamese speakers writing English.
Try Diglot freeCommon writing tasks for Vietnamese speakers
Concrete Diglot workflows by writing task — each tuned to Vietnamese-to-English transfer patterns.
How Diglot compares to alternatives
If you're evaluating writing tools, here's the honest head-to-head — when the alternative wins, when Diglot wins.
Grammar Checker for speakers of other languages
Each L1 has its own transfer-pattern profile — pick yours for the patterns Diglot specifically addresses.
Frequently asked questions
- Why do Vietnamese speakers drop the past tense in English?
- Because Vietnamese verbs never inflect. Time is marked by separate particles — «đã» (past), «đang» (ongoing), «sẽ» (future) — so the verb itself stays in its base form. When a Vietnamese writer moves to English, the habit carries over: «Last year we collect the data» instead of «collected», because the time adverb «last year» already signals the past, the way «đã» would in Vietnamese. Diglot flags missing tense as a Vietnamese inflection-transfer pattern and supplies the inflected form.
- Why are articles and plural endings missing from my writing?
- Both come from the same source: Vietnamese has no articles and no plural inflection. Nouns do not change for number, and there is no «a/an/the», so «three result», «many sample», and «temperature of sample» all feel complete in Vietnamese terms. English requires «three results», «many samples», and «the temperature of the sample». Diglot treats the missing plural -s and the missing articles as a Vietnamese-L1 pattern rather than as random omissions.
- Why do I write «The result very significant» without «is»?
- Because in Vietnamese, adjectives are stative verbs — «significant» already behaves like «is significant», so no separate copula is needed. Carried into English, this produces «The result very significant» and «This method good». English needs the verb «be»: «The result is very significant». Diglot recognises the zero-copula-before-adjective pattern as Vietnamese transfer and inserts the missing «is/are».
- Does the checker catch missing past tense and plural -s from Vietnamese?
- Yes. Both come from Vietnamese being an isolating language — verbs and nouns never inflect, and time and number are carried by particles or context. Diglot flags base-form verbs that should be past tense («we collect» → «we collected») and singular nouns that should be plural («three result» → «three results»), naming the Vietnamese inflection-transfer source rather than treating each as a one-off typo.
- Will it add the articles, the «be» before adjectives, and the dropped «it/there»?
- Yes — all three are high-frequency Vietnamese-writer patterns. Vietnamese has no articles, its adjectives are stative verbs that need no copula, and it drops subjects freely. Diglot inserts «the/a», adds «is/are» before predicate adjectives, and supplies the expletive «It is...» / «There is...», flagging each as Vietnamese-L1 transfer.
