I havn't seen the word "тебе" before.
ти (you) - тебе (genitive or accusative case)
Ви маєте серветки?
"маєте серветки" is a good option (i would think).
It's accepted, but skipping "ви" is not allowed here, it's kind of spoken language.
It's "серветку", though.
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.
Aha, I see what you mean. Thank you!
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)