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/The 'o' is o/nly pronounced 'o' in isolation. It changes to 'u' in the sentence version.
Earlier today, I quoted one of the easier to understand portions of the corresponding Wikipedia article.
Does anyone have a good guide for open and closed vowels?
Part of the problem is that some sources refer to vowel height: four levels from top [i u] to bottom [a].
Reference: Wikipedia Portuguese phonology
When unstressed, the vowels /a ɛ e ɔ o/ tend to be raised to [ɐ e ɨ o u] (although [ɨ] occurs only in EP).
EP has taken this process one step further, raising /a, ɐ/, /e, ɛ/, /o, ɔ/ to /ɐ/, /ɨ/, /u/ in all unstressed syllables. The vowels /ɐ/ and /ɨ/ are also more centralized than their BP counterparts.
In fast speech, the three unstressed vowels /ɐ, ɨ, u/ are reduced and often voiceless or elided.