Questions & Answers about W tej cukierni sprzedawca poleca dziś sernik z cynamonem.
Because the preposition w means in or inside, and when it refers to location, it normally takes the locative case in Polish.
So:
- ta cukiernia = this bakery / confectionery shop (basic dictionary form)
- w tej cukierni = in this bakery (locative form)
Both words change:
- ta → tej
- cukiernia → cukierni
This is very common in Polish: after a preposition, the noun often has to change case, and any adjective or demonstrative like ta changes too.
Cukiernia means a confectionery shop, cake shop, or pastry shop. It is a place where cakes, pastries, and sweets are sold.
It comes from cukier, meaning sugar.
So w tej cukierni is basically in this cake shop / pastry shop.