Operacija je završila.

The operation has finished.

Breakdown of Operacija je završila.

• biti: to be
• završiti: to finish
• operacija: an operation; surgery

Questions & Answers about Operacija je završila.

Why is je used in Operacija je završila?

Je is the 3rd person singular present form of biti (to be), and here it functions as an auxiliary verb.

Croatian often forms the perfect tense like this:

• auxiliary of biti
  • past participle

So:

• Operacija = the subject
• je = has
• završila = finished / ended

That is why the sentence means something like The operation finished / has ended.

Why is it završila and not završio or završilo?

Because operacija is a feminine singular noun, and the past participle must agree with the subject in gender and number.

Compare:

• operacija → feminine singular → završila
• plan → masculine singular → završio
• pismo → neuter singular → završilo

So the ending -la tells you the subject is feminine singular.

What case is operacija in here?