---
name: vietnamese-language
description: Use when asked to write, translate into, or check text in Vietnamese (Tiếng Việt) — the heavily diacritic-marked Latin alphabet (Quốc Ngữ) with six meaning-changing tones, and a kinship-based pronoun system that encodes relative age and familiarity — official in Vietnam, with Northern, Central, and Southern regional variation.
---

# Vietnamese Language

Vietnamese (Tiếng Việt) is the official language of Vietnam. Unlike
Mandarin, Japanese, or Korean, it is written in a Latin-based alphabet,
but that alphabet carries a dense system of diacritics that are
essential to meaning, not optional accents.

## Writing system: Quốc Ngữ and its diacritics

Vietnamese is written in **Quốc Ngữ**, a Latin-based alphabet developed
by missionaries and standardized in the 20th century. Its diacritics do
two jobs at once: some marks distinguish vowel quality (ơ vs. o, ư vs.
u, â vs. a), and others mark **tone**. Standard (Northern-based)
Vietnamese has six tones, each changing a syllable's meaning entirely:

- ma (level tone) — ghost
- mà (falling tone) — but/which
- má (rising tone) — mother/cheek
- mả (dipping-rising tone) — tomb/grave
- mã (creaky rising tone) — horse/code
- mạ (heavy/constricted tone) — rice seedling

Dropping or guessing at diacritics does not produce a slightly-off
version of a word — it typically produces a different real word or an
unrecognizable string, so diacritics must always be preserved exactly
in Vietnamese text, never treated as decorative or optional the way an
accent mark sometimes is in other Latin-script languages.

## No conjugation, plurals, or gender — particles carry tense/aspect

Like Mandarin, Vietnamese verbs do not conjugate for tense, person, or
number, nouns are not marked for grammatical gender, and plurality is
not marked by changing the noun's form. Instead:

- Tense and aspect are marked by separate particle words placed before
  or after the verb: đã (completed/past), đang (ongoing/present
  progressive), sẽ (future), rồi (already), and others — never by
  altering the verb itself.
- Plurality, when it needs to be explicit, is marked with separate
  words (những, các) placed before the noun rather than an inflectional
  ending.
- Word order (generally subject-verb-object) and these particle words
  carry the grammatical information that English carries through
  inflection.

## Pronouns: a kinship-based system, not just formal/informal

Vietnamese personal pronouns are one of its most distinctive features
for a learner or translator. Rather than a simple I/you plus a
formal/informal split, most everyday "pronouns" are literally kinship
terms repurposed to address people based on relative age, gender, and
social relationship — anh (older brother/older male), chị (older
sister/older female), em (younger sibling/younger person), ông
(grandfather/elderly man), bà (grandmother/elderly woman), and more,
used even between people who are not actually related. Correct usage
requires knowing (or estimating) the relative age and relationship
between speaker and listener, and the same speaker will refer to
themselves and others with different terms depending on who they are
addressing in a given conversation. This is more elaborate than a
formal/informal binary and cannot be handled with a single neutral
default the way English "you" can — choosing a term implies a specific
claimed relationship (peer, respected elder, younger person owed
guidance) each time.

## Regional variation

Vietnamese has three major regional groups — Northern (Hanoi-based),
Central (Huế-based), and Southern (Ho Chi Minh City-based) — that differ
in vocabulary, some pronunciation (including how certain tones and
consonants are realized), and a smaller amount of grammar. The
Hanoi-based Northern variety is generally used as the standard for
formal writing, national media, and education, so default to it for
formal or unspecified-audience text; regional vocabulary should only be
used deliberately, when the audience or setting calls for it.

## Common pitfalls

- Dropping or misplacing diacritics, which usually changes the word
  entirely rather than just looking slightly off.
- Treating a Vietnamese "pronoun" as a fixed word the way English "you"
  is, instead of choosing a kinship-based term appropriate to the
  specific relative age/status of speaker and listener.
- Adding an English-style plural ending or a tense-marking verb change
  instead of using the correct separate particle word.
- Applying Southern or Central regional vocabulary to a formal or
  national-audience document where Northern/Hanoi-standard usage is
  expected.
- Assuming tone marks are stylistic; they are load-bearing for meaning
  and must never be normalized away in processing or search.

## Learn more

- [[thai-language]] for a comparably tonal Southeast Asian language
  with its own distinct script and politeness system.
- [[mandarin-chinese-language]] for another tonal, non-inflecting
  language with a historical layer of shared vocabulary in Vietnamese.
- [[cross-cultural-communication]] for the relationship-assessment
  skills that correct kinship-pronoun choice depends on.