Would not "the sandwich" also be acceptable?
I wouldn't see why not, there are no articles in Ukrainian. Report it and see if they accept it.
It doesn't make much sense in the present simple tense IMO. It should be “I'm eating a sandwich”.
Їмо means we eat.
Hey, what is a канапка???
:) No, "sofa" is "канапа", but "канапка" is a small sandwich.
These words are more often used in Western Ukraine (they come from Polish).
This is an incredibly awkward english statement