Questions & Answers about Prvi krug počinje sada.
Serbian does not have articles like the or a/an.
So prvi krug can mean:
- the first round
- a first round
Which one is intended depends on context. In this sentence, it will usually be understood as the first round.
Because prvi has to agree with krug.
In Serbian, adjectives change form to match the noun in:
- gender
- number
- case
krug is:
- masculine
- singular
- nominative (because it is the subject)
So the adjective must also be masculine singular nominative:
- masculine: prvi
- feminine: prva
- neuter: prvo
Example:
- prvi krug = first round
- prva runda = first round
- prvo pitanje = first question