Questions & Answers about Na półce leżą ścierka i mop.
Because after na when you mean location in the sense of on or at, Polish often uses the locative case.
The base noun is półka = shelf.
Its locative singular form is półce.
So:
- na półce = on the shelf
- półka is just the basic dictionary form
A small spelling change happens too: k changes to c before the ending -e, which is normal in Polish declension.
This is a very important Polish pattern:
- na półce = on the shelf already there, static location
- na półkę = onto the shelf, movement toward it
So:
- Na półce leżą ścierka i mop. = They are lying on the shelf.
- Kładę ścierkę na półkę. = I put the cloth onto the shelf.
In short:
- location → often locative
- motion toward → often accusative