Otkazni rok je važan.

to be

Breakdown of Otkazni rok je važan.

• važan: important
• otkazni rok: a notice period

Questions & Answers about Otkazni rok je važan.

Why is it otkazni rok, and what does otkazni do here?

Otkazni is an adjective modifying rok.

So the phrase breaks down like this:

• rok = period, deadline, term
• otkazni = relating to otkaz (termination, resignation, dismissal)

Together, otkazni rok functions as one noun phrase: notice period.

A very literal way to think about it is termination-related period, but in normal usage it means the notice period you have to work or give before leaving a job.

What case is otkazni rok in?

It is in the nominative singular.

That is because it is the subject of the sentence:

• Otkazni rok = the thing being talked about
• je važan = is important

Both words in the subject phrase are masculine singular nominative:

• otkazni = nominative masculine singular adjective
• rok = nominative masculine singular noun

Why is there no word for the or a?

Serbian does not have articles like English a/an/the.

So:

• Otkazni rok je važan.

can mean:

• The notice period is important.
• A notice period is important.

Which one sounds best in English depends on context, but Serbian does not mark that difference with an article.