Portuguese (Brazil) · Pronunciation Guide
oo proh-feh-SOH. The double s is one plain hiss, and the final r fades to breath.
End-stressed, as r-final words are by rule, unmarked. The feminine is "professora," which adds a syllable and brings the -a default into play — so the accent shifts back onto the same vowel but is now second-to-last rather than final, and the r between vowels becomes a proper tap.
Listen: o professor
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O professor explica bem.
The teacher explains things well.
Listen: O professor explica bem.
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"O professor explica bem" contains "explica," where the x is pronounced "s" — yet another of that letter's four values. "Bem" then ends the sentence on a nasal diphthong with nothing closing it.
Lengthening the double s and adding an English r at the end are the two phonetic errors. Front-stressing it is the third. Note also that Portuguese drops the article before professions after "ser": "ele é professor," with no "um," which English speakers reliably get wrong.