Questions & Answers about Kirija i depozit su u ugovoru.
Because the subject is kirija i depozit — two things joined by i (and). In Serbian, a compound subject normally takes a plural verb, so you use su (are), not je (is).
- kirija je u ugovoru = The rent is in the contract
- depozit je u ugovoru = The deposit is in the contract
- kirija i depozit su u ugovoru = The rent and deposit are in the contract
Ugovoru is in the locative case.
The preposition u often means in or inside, and when it has that meaning, it usually requires the locative:
- ugovor = contract (dictionary form, nominative)
- u ugovoru = in the contract (locative)
So the ending changes from ugovor to ugovoru because of the preposition u.
Serbian does not have articles like English a/an and .