Questions & Answers about Peškir je u kupatilu, a sapun je blizu ogledala.
Je is the 3rd person singular present form of biti (to be) — in other words, is.
The sentence has two separate clauses:
- Peškir je u kupatilu
- a sapun je blizu ogledala
Each clause has its own subject and its own je, so repeating it is completely normal.
A often translates as and, but it is not exactly the same as English and in every situation.
Here, a links two ideas while also slightly contrasting or shifting attention:
- The towel is in the bathroom, and/as for the soap, it is near the mirror.
So a is very common when Serbian moves from one topic to another. It is weaker than ali (but), but it can still suggest a mild contrast.
Because u changes case depending on meaning.
- u + locative = in/inside a place, with no movement
- u + accusative = into a place, showing movement
Here the towel is already located in the bathroom, so Serbian uses the locative: