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I understand that Umas is the most common when referring to numbers and tempos, but there seem to be examples where algumas works too, and I have no idea why. I got this from an academic essay so I guess its realiable but not 100% sure.
"Há uns tempos, César parara num «auto-stop» e não levava oc...
English
It's time for us to consider holding an election for moderators for Portuguese.SE.
We haven't had one of these before here: all moderators have been appointed
by Stack Exchange. Right now we have only two moderators. Instead of
appointing a new moderator, we would like to hold a community...