"Do you have napkins?"
Translation:У вас є серветки?
I see "серветки" as the official translation up on top of the page. I don't know, you may be right?
The official translation, yes, but the option that I saw with маєте was сервеку. You might have had a different display though, idk.
No, it's "серветки" because the English sentence has it in plural (napkins). If you saw "серветку", that was a wrong hint.
Do you have napkins? = Маєш (маєте) серветки?
Do you have the napkin? = Маєш (маєте) серветку?
Серветку is singular, so no. Accusative of "серветки" (plural) is "серветки" (the same as Nominative)