Writing the Six Tones

Every Vietnamese syllable has one lexical tone. Quốc ngữ uses the 29 letters a, ă, â, b, c, d, đ, e, ê, g, h, i, k, l, m, n, o, ô, ơ, p, q, r, s, t, u, ư, v, x, y, then adds tone information to each written syllable. It writes six tone categories with five visible marks because ngang, the unmarked tone, uses no sign. A tone mark is part of a word's spelling: ma and má are no more interchangeable than English bit and bat.

This page teaches which written mark represents each tone. It does not yet solve every multi-vowel placement problem; use Where the Tone Mark Goes in a Vowel Sequence for that next step.

The six written categories

The traditional tone names are ordinary Vietnamese words and must themselves be written correctly: ngang, huyền, sắc, hỏi, ngã, nặng.

The last sentence is natural (regional: Southern; informal). In broadly neutral Vietnamese, mẹ mình is a common alternative. Register and regional labels belong to vocabulary choices; the tone spelling of má remains sắc wherever the word is quoted or written.

Tone belongs to the syllable

The visible sign sits on or under one vowel letter, but it identifies the tone of the entire syllable. In tiếng, the acute mark is printed on ê, yet it is not a special “high ê” pronounced separately from t, i, and ng. Assemble the syllable, then pronounce its tone across that syllable.

The spellings tiếng Việt, Nguyễn, quà, and nghiêng show several combinations. Nghiêng has ngang, so it has no visible tone mark; the absence of a mark is meaningful. Nguyễn carries ngã, quà carries huyền, tiếng carries sắc, and Việt carries nặng.

Tone marks versus vowel-letter marks

Vietnamese uses diacritics for two different jobs. The breve, circumflex, and horn help create distinct vowel letters: ă, â, ê, ô, ơ, ư. The acute, grave, hook, tilde, and dot below write tones. A letter can carry both jobs at once.

Deleting the tone but retaining the vowel letter is still a spelling change: ơ and ờ have the same vowel identity but different tones. Deleting the horn as well produces o, another vowel letter.

Here tớ and trước carry sắc, sẽ carries ngã, đợi carries nặng, ở carries hỏi, and cửa carries hỏi. The pronoun tớ is (informal; especially common in Northern peer speech). Each mark is attached graphically to one letter while classifying a whole syllable.

Spelling is stable across regional tone systems

The acoustic realization of the six categories differs across Northern, Central, and Southern Vietnamese. Many Southern speakers merge hỏi and ngã in pronunciation; some Central systems reorganize the categories in other ways. Standard spelling still distinguishes hỏi and ngã. You cannot choose between them by listening to a merged dialect alone; learn the written tone with the vocabulary item.

In many Southern voices, the hỏi of hỏi and the ngã of mã do not contrast as they do in many Northern voices. The sentence remains spelled exactly as shown.

Detailed pitch arrows are deliberately omitted here. Labels such as “rising” and “falling” can be useful for one reference accent but misleading for another. The spelling categories are national; pronunciation instruction must specify a regional model.

Tone restrictions in stopped syllables

Syllables ending in p, t, c, or ch are traditionally called “checked” or stopped syllables. In standard spelling, they occur with sắc or nặng, not with all six tone categories. Common examples include thích, tốt, học, and đẹp.

This restriction belongs to Vietnamese phonological history and the modern lexicon; it is not a reason to invent forms by mechanically adding all six marks to hoc or sach.

Typing the marks

Use a Vietnamese input method rather than omitting marks until later. With Telex, common tone keys are s (sắc), f (huyền), r (hỏi), x (ngã), and j (nặng); z commonly removes a tone mark. VNI commonly uses the digits 1–5 for the five marked tones. Operating systems may allow you to type the tone key after the vowel or at the end of the syllable.

The final stored text should use proper Unicode and NFC normalization. A precomposed-looking ễ and a decomposed sequence may render alike but compare differently in software. This matters in search, filenames, learner answers, and databases.

A tone changes the interpretation

The joke works because mã “code” has ngã, while ma “ghost” has ngang. The missing tilde produces another real word, not merely an accented version of the same one.

Common Mistakes

1. Treating unmarked text as acceptable Vietnamese

The correction restores ô, đ, the nặng marks in học and Việt, and the sắc mark in tiếng.

2. Confusing hỏi with ngã because your target accent merges them

Learn mả with hỏi and mã with ngã as separate lexical spellings, even if your regional pronunciation merges the tones.

3. Using a punctuation mark after the vowel

The actual hook, tilde, and acute must combine with the appropriate vowel letters.

4. Keeping a tone but losing the vowel letter

Tone and vowel quality are independent layers; both must survive.

Key Takeaways

• The six tones are ngang, huyền, sắc, hỏi, ngã, nặng.
• Ngang has no visible mark; the other five use grave, acute, hook, tilde, and dot below.
• A mark is printed on one vowel but assigns tone to the whole syllable.
• Vowel-letter diacritics and tone marks do different jobs and may stack.
• Regional tone mergers never authorize merged spellings.