Portuguese (Brazil) · Pronunciation Guide
ah eeh-MAH(ng). Like the masculine but ending in a plain nasal a, with no w-glide.
End-stressed, since words ending in a nasal vowel take final stress by rule, and the tilde is marking nasality alone. The masculine-feminine pair is unusually instructive: "irmão" ends in a nasal diphthong and "irmã" in a simple nasal vowel, so the gender difference is carried by the presence or absence of a glide rather than by a vowel swap.
Listen: a irmã
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Tenho duas irmãs.
I have two sisters.
Listen: Tenho duas irmãs.
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"Tenho duas irmãs" uses "duas," the feminine form of two — Portuguese genders that number, so "dois irmãos" and "duas irmãs" both change. The plural "irmãs" adds an s to the nasal vowel without altering it, so the word stays two syllables.
Adding a w-glide gives "eeh-MOWNG," which is the masculine form and changes who you're talking about. Keep the nasal vowel plain. Learners also close it with a consonant, and they forget that "duas" rather than "dois" is required — a gender agreement error that Brazilians notice immediately.