"Your birthday is not in October."
Translation:Wasze urodziny nie są w październiku.
Why is the plural form correct here? Wouldn't it translate by "Your birthdays are in october"?
Yes, but it would be "Wasze urodziny" and not "twoje...". Twoje suggests singular
Thanks, for the answer! KamilKubac : If you're talking about one person's birthday it's twoje, if you're talking about 2 persons birthdays it's wasze. In both case urodziny stays plural in polish. (Same as your cat/your cats, for both case you can be speaking to either one or several people, thus "your" can be singular or plural in both cases)