"You are swimming."
I only use English as a medium. I would I know if Duo means the plural if they do not add ALL or PEOPLE to indicate the difference to be translated as DU or IHR. Could anyone please give a tip about it?
"Du bist" and "Ihr seid" are both rendered "you are" in English. "You all are" is colloquial and mostly heard in the southern US.
Agree with lisadoglio - it is impossible to know whether this is plural or singular. In this case Ihr or Sie schwimmen should be also correct, no?