Najava projekcije traje kratko.

• najava = the subject of the sentence. It is a feminine singular noun in the nominative case.
• projekcije = a noun in the genitive singular, dependent on najava.
• traje = the verb, 3rd person singular present tense of trajati = to last
• kratko = an adverb, describing how long something lasts, here in the sense of briefly / for a short time

So the basic structure is:

[subject] + [related noun in genitive] + [verb] + [adverb]

Because najava often takes a noun in the genitive to show what is being announced.

So:

• najava filma = announcement of the film
• najava događaja = announcement of the event
• najava projekcije = announcement of the screening

This is very common in Croatian. English often uses of, but Croatian often expresses that relationship with the genitive case instead.

So projekcije is not the subject. It is part of the noun phrase najava projekcije.

Yes. In this sentence, najava projekcije functions as a single noun phrase.

The head noun is najava, and projekcije specifies it further:

• najava = announcement
• projekcije = of the screening

Together they mean something like the screening announcement or the announcement of the screening.

Grammatically, the verb agrees with najava, not with projekcije.

That is why the verb is traje and not a plural form.

Traje is the 3rd person singular present form of trajati.

Because the subject is najava, which is:

• singular
• feminine

the verb must be 3rd person singular:

• najava traje = the announcement lasts

Croatian verbs do not need a separate subject pronoun like it here. The verb ending already shows the person and number.

Because kratko here is an adverb, not an adjective.

Compare:

• kratka najava = a short announcement
  
  • here kratka is an adjective describing the noun najava
• najava traje kratko = the announcement lasts briefly / for a short time
  
  • here kratko is an adverb describing the verb traje

A useful pattern is:

• adjective: kratak / kratka / kratko
• adverb: kratko

So in this sentence, kratko does not agree with najava because it is not describing the noun directly.

Yes, but it means something slightly different in structure.

• Najava projekcije traje kratko = the announcement lasts a short time
• Najava projekcije je kratka = the announcement is short

In many situations, these are very similar in meaning. But grammatically they are different:

• traje kratko uses a verb of duration plus an adverb
• je kratka uses biti
  • adjective

Both are possible, but the original sentence focuses more directly on duration.

No, Croatian word order is fairly flexible.

The neutral order here is:

• Najava projekcije traje kratko.

But you may also hear:

• Najava projekcije kratko traje.

Both are understandable. The difference is mostly one of emphasis or style.

In general:

• final position often gives a word a little more emphasis
• Croatian allows movement of adverbs more easily than English does

Still, the original order is perfectly normal.

Because Croatian has no articles like English a / an / the.

So najava projekcije can mean, depending on context:

• an announcement of the screening
• the announcement of the screening
• sometimes just screening announcement

The exact interpretation comes from the situation, not from an article.

This is something English speakers often need time to get used to.

In this sentence, projekcije is most naturally understood as genitive singular of projekcija.

That means:

• nominative singular: projekcija
• genitive singular: projekcije

It can also look like a nominative plural form in other contexts, but here the grammar strongly points to genitive singular, because it depends on najava.

So here it means of the screening, not screenings.

Najava usually means:

• announcement
• notice
• introduction
• preview

The exact English translation depends on context.

So najava projekcije could refer to:

• an announcement that a screening will happen
• a spoken or written introduction before a screening
• a short promotional notice for a screening

Croatian najava is a broad word, so context matters.

Sometimes yes, but you should be careful.

In English, shortly often means soon:

• The film will start shortly.

Croatian kratko here does not mean soon. It means:

• briefly
• for a short time
• not long

So in this sentence, kratko is about duration, not about time in the future.

That is an important distinction.

The dictionary forms are:

• najava
• projekcija
• trajati
• kratko is the adverb, related to the adjective kratak

So if you want to look them up, those are the forms to search for.

Yes, it is understandable and natural.

It is a straightforward sentence with normal grammar:

• noun phrase: najava projekcije
• verb: traje
• adverb: kratko

Depending on context, a speaker might also choose another phrasing, such as:

• Najava projekcije je kratka.
• Najava projekcije ne traje dugo.

But the original sentence is absolutely fine and idiomatic.