Premijera se može rasprodati večeras.

Premijera is nominative singular, because it is the subject of the sentence.

• premijera = the premiere
• It is a feminine noun
• The verb može is also in 3rd person singular, matching that singular subject

So the basic structure is:

Premijera + može + se rasprodati + večeras
The premiere + can/may + sell out + tonight

Here se is not really reflexive in the sense of herself/itself. In this sentence, it is part of the verb expression rasprodati se, which means to sell out.

So:

• rasprodati = to sell completely / to sell off
• rasprodati se = to become sold out / to sell out

This is a very common pattern in Croatian: se often helps form a middle or passive-like meaning.

So Premijera se može rasprodati is not saying that the premiere does something to itself. It means that all tickets for the premiere may get sold.

Because after the modal verb moći (can, be able to, may), Croatian normally uses the infinitive.

Here:

• može = can / may
• rasprodati se = to sell out

So:

• može se rasprodati = can/may sell out

You would not normally say Premijera se može rasproda. After može, the infinitive rasprodati is the correct form.

It can be translated in a few ways depending on context:

• can sell out
• may sell out
• might sell out

In this sentence, može most naturally expresses possibility, not physical ability. So in many contexts, English may or might is a very good translation.

So the feeling is:

• There is a chance the premiere will sell out tonight

rather than

• The premiere has the ability to sell out tonight

Rasprodati se is perfective. That matters because selling out is naturally seen as a completed result: either the tickets end up fully sold, or they do not.

Perfective verbs in Croatian often focus on:

• a completed action
• a single whole event
• a result

Here the result is important: becoming sold out.

With modal verbs like može, a perfective infinitive is very normal when you mean that a completed event is possible:

• Može se rasprodati = It may end up sold out

Grammatically, premijera is the subject, but semantically the sentence really means that the tickets for the premiere may all be sold.

This is similar to English, where we also say:

• The show sold out
• The concert sold out

We do not literally mean the event itself was sold like an object. We mean all available tickets were sold.

So Croatian uses the same kind of shorthand.

Večeras means this evening or tonight.

It is an adverb of time, so it tells you when the possible sellout may happen.

Examples:

• Vidimo se večeras. = See you tonight.
• Premijera se može rasprodati večeras. = The premiere may sell out tonight.

In many contexts, tonight is the most natural translation.

Yes. Croatian word order is more flexible than English word order.

The sentence:

Premijera se može rasprodati večeras.

could also appear as:

• Večeras se premijera može rasprodati.
• Premijera se večeras može rasprodati.

These versions are all possible, but the emphasis changes slightly.

A rough guide:

• Premijera... first = focus starts on the premiere
• Večeras... first = focus starts on tonight

The original sentence sounds natural and neutral.

Because the subject premijera is singular.

The verb moći here is conjugated in 3rd person singular present:

• ja mogu
• ti možeš
• on/ona/ono može

Since premijera is singular, Croatian uses može.

If the subject were plural, the verb would change:

• Premijere se mogu rasprodati večeras.
  The premieres may sell out tonight.

Not exactly.

• Premijera je rasprodana. = The premiere is sold out.
• Premijera se može rasprodati večeras. = The premiere may/can sell out tonight.

The first sentence describes a state that already exists.

The second sentence describes a possibility that may happen later.

So:

• je rasprodana = already sold out
• može se rasprodati = may become sold out

In this meaning, se is normally needed.

• rasprodati se = to sell out
• without se, rasprodati is usually understood more as to sell off completely something

So se helps make the verb work in this intransitive/passive-like way.

That is why Premijera može rasprodati večeras would sound wrong for the intended meaning.

No. Premijera can refer to different kinds of first public performances or first showings, such as:

• a film premiere
• a theatre premiere
• an opera or ballet premiere
• sometimes another first official presentation

In this sentence, the exact type depends on context. The grammar stays the same either way.

A fairly literal gloss would be:

Premijera = the premiere
se = middle/passive-like marker
može = can / may
rasprodati = sell out / become fully sold
večeras = tonight

So the structure is roughly:

The premiere may sell itself out tonight

But that is only a literal grammatical guide. Natural English is:

The premiere may sell out tonight.