Ako krenemo ranije, stići ćemo na vlak.

Ako means if and introduces a condition.

So the sentence has this structure:

• Ako krenemo ranije = If we leave earlier
• stići ćemo na vlak = we will make it to / catch the train

This is a very common Croatian pattern for real, possible conditions.

After ako, Croatian normally uses the present tense, even when English would often use a future meaning.

So Croatian says:

• Ako krenemo ranije...

not usually:

• Ako ćemo krenuti ranije... ❌

This works similarly to English If we leave earlier, we’ll catch the train, where English also uses a present form leave in the if-clause, not will leave.

So krenemo is grammatically present tense, but in this sentence it refers to a future possibility.

Krenemo is the 1st person plural present tense form of krenuti.

• infinitive: krenuti = to set off, to leave, to start going
• krenemo = we set off / we leave

Here it means if we leave / if we set off.

Also, krenuti is a perfective verb, so its present-tense forms often refer to a single completed future action, especially in clauses like this.

Krenuti emphasizes the moment of setting off or starting to go.

Compare:

• krenuti = to set off, start out
• ići = to go, be going

So Ako krenemo ranije focuses on leaving earlier, not just the general act of going.

A more natural English translation might be:

• If we set off earlier, we’ll catch the train
• or simply If we leave earlier, we’ll catch the train

Ranije means earlier, while rano means early.

Compare:

• krenuti rano = to leave early
• krenuti ranije = to leave earlier

So ranije is a comparative adverb. It implies comparison with some other time:

• earlier than planned
• earlier than usual
• earlier than now intended

Stići ćemo is the future tense of stići.

It is formed with:

• infinitive: stići = to arrive, reach, make it
• auxiliary: ćemo = we will

So:

• stići ćemo = we will arrive / we will make it

It is written as two words because Croatian future tense is often built with the infinitive + a clitic form of htjeti:

• ja ću stići
• mi ćemo stići

But when the infinitive comes first, you often see:

• stići ću
• stići ćemo

Both the verb and the auxiliary are separate words.

Both are possible, but stići ćemo is very natural here.

Croatian clitics such as ću, ćeš, će, ćemo, ćete often prefer the second position in the clause. Because of that, the infinitive is often placed first:

• stići ćemo na vlak

You can also hear:

• Mi ćemo stići na vlak

That is also correct, because now ćemo is in second position after Mi.

So the choice is largely about normal Croatian word order and clitic placement.

Stići na vlak means something like:

• to make it to the train
• to catch the train in time

It does not literally mean getting physically on top of the train. This is just the normal Croatian expression.

The idea is that you arrive in time for the train.

After stići, Croatian often uses na for events, transport, and places you are trying to make it to in time.

So:

• stići na vlak = make it to the train
• stići na autobus = make it to the bus
• stići na vrijeme = be on time

Here na vlak is the standard expression.

By contrast, u vlak would suggest movement into the train, focusing more literally on entering it, not the idiomatic idea of catching it in time.

Because na here takes the accusative case, and vlak is a masculine inanimate noun whose accusative singular is the same as the nominative singular.

So:

• nominative: vlak
• accusative: vlak

That is why the form does not visibly change.

Yes, the comma is standard here.

Croatian normally separates an ako-clause from the main clause with a comma:

• Ako krenemo ranije, stići ćemo na vlak.

This is just like English:

• If we leave earlier, we’ll catch the train.

Yes.

You can also say:

• Stići ćemo na vlak ako krenemo ranije.

That means the same thing: We’ll catch the train if we leave earlier.

When the ako-clause comes first, you use a comma after it. When it comes second, there is usually no comma before ako.

Because the sentence talks about two single, complete actions:

• krenuti = to set off
• stići = to arrive / make it

Perfective verbs are very common when Croatian refers to one completed event in the future.

Here the logic is:

1. we set off earlier
2. as a result, we make it to the train

If you used imperfective verbs, the meaning would shift toward an ongoing or habitual action rather than one specific completed outcome.

Not naturally in English.

Although stići often means to arrive, the phrase stići na vlak is better understood as:

• catch the train
• make it to the train
• get to the train in time

So a natural English translation would usually avoid arrive at the train, even if that is close to the literal meaning.

A simple approximation is:

• stići ≈ STEE-chee, but with a softer ch sound

The letter ć is a soft consonant that does not have a perfect English equivalent. English speakers often pronounce it somewhere near a very soft ch.

Also:

• krenemo ≈ KREH-neh-mo
• ranije ≈ RAH-nee-yeh
• vlak = one syllable, roughly vlahk

These are only approximations, but they can help at the start.