Portuguese (Brazil) · Pronunciation Guide
MAHSS, with a plain open "ah" — no glide. Keep it clearly distinct from "mais," which sounds like "mice."
One syllable, unaccented, and in practice lightly stressed — it's a conjunction hinging two clauses rather than a content word. In rapid speech Brazilians reduce it further, and the boundary between "mas" and "mais" genuinely blurs, which is why listeners rely on the grammar of the sentence to disambiguate them.
Listen: mas
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Eu quero ir, mas não posso.
I want to go, but I can't.
Listen: Eu quero ir, mas não posso.
Free browser voice. Hear it read by a real native speaker inside the LingoDrop app.
"Eu quero ir, mas não posso" pivots on this word, and everything after it is negated. Notice "não posso" — the nasal diphthong of "não" running into a double s that stays unvoiced, giving "nowng-POH-soo." The comma in writing corresponds to a real slight pause in speech, which is unusual for Portuguese punctuation.
The main hazard is the "mais" collision: saying "mice" when you mean "but" produces a sentence that means something quite different. Keep the vowel simple. English speakers also tend to stress the conjunction heavily, as we do with "but," whereas Brazilians throw it away and put the weight on the clause after it.