Ako želiš, ja ću izabrati film za večeras.

Ako means if. It introduces a condition:

• Ako želiš = If you want
• ja ću izabrati film za večeras = I will choose a film for tonight

So the whole sentence has the structure if + condition, then + result, just like in English.

Želiš is the 2nd person singular present tense form of željeti / želiti, meaning to want.

So:

• ja želim = I want
• ti želiš = you want
• on/ona želi = he/she wants

In this sentence, želiš matches an understood ti = you.

Croatian often leaves subject pronouns out because the verb ending already shows who the subject is.

• želiš already tells you it means you want
• so ti is not necessary

This is very common in Croatian. You could say Ako ti želiš, but that would usually add emphasis or contrast, something like If you want.

No, ja is not strictly necessary. Croatian often drops subject pronouns, so this could also be:

• Ako želiš, ću izabrati film za večeras — this is not correct, because ću cannot stand first in its clause
• Ako želiš, izabrat ću film za večeras — correct
• Ako želiš, ja ću izabrati film za večeras — also correct

Here, ja is probably used for clarity or emphasis:

• If you want, I will choose the film for tonight

So ja makes the speaker a bit more explicit.

This is the future tense in Croatian.

It is formed with:

• a short form of htjeti = to want / will
• plus the infinitive of the main verb

Here:

• ću = I will
• izabrati = to choose

So:

• ja ću izabrati = I will choose

The short future forms are:

• ću = I will
• ćeš = you will
• će = he/she/it will
• ćemo = we will
• ćete = you will
• će = they will

Both are correct.

Croatian future tense can appear in two common patterns:

• ja ću izabrati
• izabrat ću

In everyday usage, both are natural. The difference is mostly about word order and style.

A useful rule for learners:

• if the auxiliary ću comes before the infinitive, the infinitive usually stays in full form: ću izabrati
• if the infinitive comes before the auxiliary, it often drops the final -i: izabrat ću

So:

• Ja ću izabrati film.
• Izabrat ću film.

Both mean I will choose the film.

This is about aspect, which is very important in Croatian verbs.

• birati = imperfective, focusing on the process or repeated action of choosing
• izabrati = perfective, focusing on completing the choice

In this sentence, the speaker means I will make the choice / I will pick one, so izabrati is the natural choice.

English often just says choose, but Croatian distinguishes more clearly between:

• I will be choosing / choosing in general → often imperfective
• I will choose / make a final choice → often perfective

Za večeras means for tonight.

• za = for
• večeras = tonight / this evening

So film za večeras means a film for tonight, in the sense of the film we’re going to watch tonight.

This use of za is very common when talking about something intended for a particular time:

• plan za sutra = a plan for tomorrow
• nešto za ručak = something for lunch
• film za večeras = a film for tonight

Večeras is a very common adverb meaning tonight / this evening.

So:

• za večeras = for tonight

You can also express similar ideas in other ways, but večeras is the most natural and common word here.

Compare:

• Večeras gledamo film. = We’re watching a film tonight.
• film za večeras = a film for tonight

The comma separates the conditional clause from the main clause.

• Ako želiš, = If you want,
• ja ću izabrati film za večeras. = I will choose a film for tonight.

This is similar to English, where we also usually write a comma when the if-clause comes first:

• If you want, I’ll choose the film for tonight.

Croatian word order is more flexible than English word order, but not completely free.

This sentence can appear in more than one natural form, for example:

• Ako želiš, ja ću izabrati film za večeras.
• Ako želiš, izabrat ću film za večeras.
• Ja ću, ako želiš, izabrati film za večeras.

The meaning stays very similar, but the emphasis can shift slightly.

One thing to remember is that the short future forms like ću behave like clitics, so they usually cannot stand in just any position.

These sounds can be tricky for English speakers.

In this sentence you have:

• ž in želiš
• ć in ću
• č in večeras

A rough guide:

• ž sounds like the s in measure
• č sounds like ch in church
• ć is softer than č; many learners hear it as a softer ty/ch-like sound, though the exact pronunciation depends on dialect

So approximately:

• želiš ≈ zhe-lish
• ću ≈ a soft tyoo / chyoo
• večeras ≈ ve-che-ras

These are only approximations, but they help at the beginning.

Yes. Izabrati can often be translated as:

• choose
• pick
• pick out
• select

The best English translation depends on context. In this sentence, choose is the most natural neutral translation.

Yes.

• film = a film / the film depending on context
• neki film = some film / a certain film

So:

• Ako želiš, ja ću izabrati film za večeras. = If you want, I’ll choose a film for tonight.
• Ako želiš, ja ću izabrati neki film za večeras. = If you want, I’ll choose some film for tonight.

Usually the version without neki sounds more natural here.

You understand that from context.

Croatian does not have a/an/the, so film can mean:

• a film
• the film

In this sentence, English naturally uses a film:

• I’ll choose a film for tonight

Why? Because the speaker is talking about choosing one film, not referring to a previously identified specific film.

If the context made a specific film obvious, English might use the film, but Croatian still just says film.

Yes, it sounds natural and polite enough in everyday speech.

Ako želiš makes the offer sound soft and considerate:

• If you want, I’ll choose a film for tonight.

It does not sound pushy. It sounds like the speaker is offering to take care of the choice.