Vietnamese → Portuguese
Portuguese uses 35 sounds. You already own 20 of them from Vietnamese. The other 15 are the work — and 13 of those are the dangerous kind: close enough to something you already say that you will substitute them without hearing yourself do it.
The silent swaps
Your mouth has something close enough to reach for. These survive for years precisely because they sound right to you — the fix is hearing the difference first, not trying harder.
the move: alveolar → postalveolar
Portuguese: key · written "x", "ch", "s (final)"
Also every syllable-final s: os livros = /uʒ ˈlivɾuʃ/.
Your /s/ is the one in xin (to ask for; please).
the move: alveolar → postalveolar
Portuguese: today · written "j", "g"
Your /z/ is the one in dạ (yes (polite)).
the move: close, but not identical
Portuguese: mouth · written "b"
Your /ɓ/ is the one in ba (three; father).
the move: close, but not identical
Portuguese: finger · written "d"
Brazil: /d͡ʒ/ before i — dia sounds like 'jee-a'.
Your /ɗ/ is the one in đi (to go).
the move: close, but not identical
Portuguese: time · written "em", "en"
Your /e/ is the one in đêm (night).
the move: close, but not identical
Portuguese: yes · written "im", "in"
Your /i/ is the one in đi (to go).
the move: close, but not identical
Portuguese: good · written "õ", "om", "on"
Your /ɤ/ is the one in cơm (cooked rice; a meal).
the move: close, but not identical
Portuguese: one, a · written "um", "un"
Your /ɯ/ is the one in thư (letter).
the move: front → central
Portuguese: small · written "e (unstressed)"
The vowel that vanishes. Often deleted outright, which is why European Portuguese sounds like a run of consonants.
Your /i/ is the one in đi (to go).
the move: velar → uvular
Portuguese: car · written "rr", "r- (initial)"
Back in the throat, like French r. Brazil often makes it /h/.
Your /ɣ/ is the one in gà (chicken).
the move: nasal → lateral
Portuguese: son · written "lh"
Your /ɲ/ is the one in nhà (house).
Words you may say identically
Two or more Portuguese sounds landing on one sound of yours. Until the ear separates them, the mouth cannot — which is what the ear trainer is for.
Genuinely new
Nothing in Vietnamese sits close to these. They sound foreign in your mouth — which is the good news: you can hear that you are not saying them yet.
Rhythm and pitch
The layer spelling never records, and the one that makes a correct sentence still sound foreign.
| Vietnamese | Portuguese | |
|---|---|---|
| Rhythm | Syllable-timed, one tone per syllable | Stress-timed (Portugal) |
| Stress | No lexical stress. Every syllable carries its own tone and its own full vowel, and none is reduced. What sounds like stress to an English ear is a syllable holding its tone longer or louder for emphasis, and grammatical words (đã, sẽ, được) being said lighter and faster than content words. | Contrastive and written. The default is the second-to-last syllable; anything else takes an accent, and the accent also picks between open and close vowels — avó /ɔ/ is a grandmother and avô /o/ is a grandfather. |
| Pitch | lexical tone — pitch changes the word | No lexical tone. Intonation carries questions on its own — Portuguese changes nothing else about the sentence, so the rise is doing all the work. |
What you have that Portuguese doesn't
15 sounds with no job in Portuguese. They are not mistakes — but they are where an accent leaks in, because a sound you own is easy to use when a hard one is due.
The honest caveat
This is a prediction from the shape of two sound systems, not a recording of you. It says what your inventory makes likely — it cannot know that your Vietnamese has a regional variety that already owns one of these, or that you learned Portuguese from someone whose accent you copied. A teacher listening to you beats it. Use it to know what to listen for.
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