Detektiv je nazvao operatora.

Je is the 3rd person singular present form of biti (to be), and it is used as an auxiliary to form the past tense.

So:

• je nazvao = called / has called

In Croatian, the usual past tense is made with:

• the auxiliary biti
• plus a past participle

So Detektiv je nazvao operatora. is a normal past-tense sentence.

Nazvao is the masculine singular past participle form of the verb nazvati (to call).

It agrees with the subject:

• detektiv is masculine singular
• so the participle is nazvao

Compare:

• Detektiv je nazvao... = masculine singular
• Detektivka je nazvala... = feminine singular
• Dijete je nazvalo... = neuter singular
• Detektivi su nazvali... = masculine plural or mixed plural

So the ending -ao here matches a masculine singular subject.

Because operatora is the accusative singular form, and here it is the direct object of the verb nazvati.

For many masculine animate nouns in Croatian:

• nominative singular: operator
• accusative singular: operatora

This is very common:

• vidim čovjeka = I see the man
• poznajem profesora = I know the professor
• nazvao je operatora = he called the operator

So operatora tells you that this noun is the object, not the subject.

Because detektiv is the subject of the sentence, so it is in the nominative singular.

For many masculine nouns, the nominative singular has no special ending added:

• detektiv
• operator
• student
• profesor

So in this sentence:

• Detektiv = nominative, the person doing the action
• operatora = accusative, the person receiving the action

That contrast helps you see who called whom.

No. Croatian does not normally use articles like English the and a.

So detektiv can mean:

• the detective
• a detective

And operatora can mean:

• the operator
• an operator

The exact meaning depends on context. In a translation exercise, the intended meaning is often given to you, but the Croatian sentence itself does not mark this with articles.

The basic verb is nazvati.

This is a perfective verb, which usually presents the action as a completed whole. In this sentence, it suggests one completed act of calling.

A related imperfective verb is zvati.

Very roughly:

• nazvati = to call, in the sense of completing the call
• zvati = to call / be calling / call repeatedly, depending on context

So Detektiv je nazvao operatora. sounds like a completed event: the detective made the call.

Because je is a clitic, and Croatian clitics usually go in the second position of the clause.

So the neutral order is:

• Detektiv je nazvao operatora.

Here, Detektiv is the first element, and je comes right after it.

This second-position behavior is very common in Croatian with short unstressed words like:

• je
• sam
• si
• ga
• se

You will often see similar patterns such as:

• Jučer je detektiv nazvao operatora.
• Detektiv ga je nazvao.

Yes. Croatian word order is more flexible than English because case endings show grammatical roles.

For example, these can all be possible with different emphasis:

• Detektiv je nazvao operatora.
• Operatora je nazvao detektiv.
• Nazvao je operatora detektiv.

The basic meaning can stay the same, but the focus changes.

The original sentence is the most neutral and straightforward version for a learner:

• subject first
• clitic second
• verb
• object

A simple learner-friendly pronunciation is:

• NAZ-va-o

The tricky part is that -ao is pronounced as two vowel sounds, not one English-style vowel.

Very roughly:

• Detektiv je nazvao operatora
• de-TEK-tiv ye NAZ-va-o o-pe-RA-to-ra

A few helpful notes:

• j in Croatian sounds like English y in yes
• z is like English z
• v is like English v
• stress is not marked in normal spelling, so listening to native audio is helpful

Yes, depending on context, English may translate it as either:

• The detective called the operator.
• The detective has called the operator.

Croatian past tense does not map perfectly onto English past vs. present perfect. In many cases, the same Croatian form can be translated either way, depending on the situation.

So je nazvao is a standard past form, and English chooses the best equivalent from context.