Questions & Answers about Čeona lampa, kabanica i čuturica su u rancu.
Because the subject is plural: it is a list of three things — čeona lampa, kabanica i čuturica.
In Serbian, just like in English, a compound subject joined by i (and) normally takes a plural verb.
- je = is
- su = are
So:
- Lampa je u rancu. = The lamp is in the backpack.
- Lampa i kabanica su u rancu. = The lamp and the raincoat are in the backpack.
The three listed items are in the nominative, because they form the subject of the sentence:
- čeona lampa
- kabanica
- čuturica
The word rancu is in the locative singular, because it follows u in the meaning of location:
- u rancu = in the backpack
So the structure is:
- [Subject in nominative] + su + [location phrase]