May I have your atention, please?
I am a citizen: Eu sou um cidadão.
He is a citizen: Ele é um cidadão.
They are citizens: Eles são cidadãos.
She is a citizen: Ela é uma cidadã.
They are citizens: Elas são cidadãs.
Som is a word and it means sound, sound system.:))
This is too personal
The audio são sounds very much more like som. Granted, that's not a word. But it's still confusing
Som is a word and it means sound.
What about cidadões? like the plural of coração is corações.
Not always "-ão" becomes "-ões" in the plural form. E.g. Irmão -> irmãos, but not "irmões". There's no rule about it, as far as I know, we just need to remember.