Portuguese (Brazil) · Pronunciation Guide
SEH-too with an open first vowel, a breathy r, and a final o that raises to "oo."
Front-stressed, which the -o ending delivers by default without any accent. The open quality of that stressed e goes entirely unmarked in the spelling, and there's no rule to derive it from — it simply travels with the word, the way it does in "nove" and "sete."
Listen: certo
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Acho que você está certo.
I think you're right.
Listen: Acho que você está certo.
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"Acho que você está certo" opens with the hedging "acho que" that Brazilians use constantly. "Está" would normally shrink to "tá" in speech, and the adjective agrees with whoever you're addressing, so it becomes "certa" when you're telling a woman she's right.
Using a closed "ay" in the first syllable makes the word drift toward a different vowel than Brazilians use — keep the jaw open. The r is the second issue, since "SER-toh" with an American r is the reflexive English reading. And there's a false-friend risk: "certo" means right or correct, while "certain" in the sense of some particular one is "certo" placed before the noun, as in "um certo dia."