"My mother is taking an umbrella."
Translation:Moja mama bierze parasol.
I've put parasol in sing. masc. instrumental parasolem I don't even know if this word exists
It exists, it is correct sing. masc. Instrumental, but why did you use it? It doesn't suit the sentence. "taking" something takes Accusative. Which luckily here (masculine inanimate word) looks the same as Nominative.