Ako nemaš sitniš, ja ću platiti kavu.

Ako means if. It introduces the condition:

• Ako nemaš sitniš = If you don’t have any change
• ja ću platiti kavu = I’ll pay for the coffee

So the whole structure is a very normal if ... then ... sentence.

In Croatian, after ako, you normally use the present tense for a real future condition:

• Ako nemaš sitniš, ja ću platiti kavu.

Literally, this is like If you don’t have change, I will pay for the coffee.

This is different from English, where learners sometimes expect a future form after if, but English also usually uses the present there: If you don’t have change, I’ll pay.

So this pattern is completely normal in both languages.

Because the negative form of imati (to have) is irregular and is written as one word:

• imam = I have
• nemaš = you do not have

Full present tense of the negative is:

• nemam = I don’t have
• nemaš = you don’t have
• nema = he/she/it doesn’t have
• nemamo = we don’t have
• nemate = you don’t have
• nemaju = they don’t have

So nemaš is simply the standard negative form of imaš.

Sitniš means small change, especially coins or low-value money.

So here:

• nemaš sitniš = you don’t have any change / you don’t have small change

It is a very useful everyday word. A related word is kusur, but that usually means change returned after paying, while sitniš means small change in general.

Yes, Croatian often leaves subject pronouns out, because the verb already shows the person.

So these are possible:

• Ako nemaš sitniš, ja ću platiti kavu.
• Ako nemaš sitniš, platit ću kavu.

Adding ja gives a bit more emphasis, like:

• I’ll pay for the coffee
• I will pay

So ja is not required, but it can add contrast or emphasis.

This is how the Croatian future tense often works.

Future I is made with:

• a form of htjeti used as an auxiliary: ću
• the infinitive: platiti

So:

• ja ću platiti = I will pay

Croatian clitics like ću usually go in the second position of the clause. Because ja is the first element, ću comes right after it:

• ja + ću + platiti

If there is no word before ću, Croatian often uses the shortened infinitive form instead:

• Platit ću kavu.

So both are normal, but the word order follows clitic placement rules.

Because kavu is the accusative singular of kava.

• kava = coffee (dictionary form / nominative)
• kavu = coffee (direct object / accusative)

In this sentence, coffee is the thing being paid for, so it is the direct object:

• platiti kavu = to pay for the coffee

This is why the form changes from kava to kavu.

Croatian commonly uses platiti directly with the thing being paid for:

• platiti kavu = pay for the coffee
• platiti račun = pay the bill
• platiti ručak = pay for lunch

So although English usually needs for, Croatian often does not.

A useful idea is:

• platiti nešto = pay for something

So platiti kavu is completely natural Croatian.

Because platiti is the perfective verb, and it refers to a single completed act of paying.

• platiti = to pay, to finish paying
• plaćati = to be paying / to pay repeatedly / habitually

In this sentence, the speaker means one specific future action:

• I’ll pay for the coffee

That is why platiti is the better choice here.

If you used plaćati, it would sound more like an ongoing or repeated action, which does not fit this situation as well.

Because Croatian has no articles.

English distinguishes:

• a coffee
• the coffee

Croatian usually just says:

• kava / kavu

The exact meaning comes from context. So kavu could mean:

• a coffee
• the coffee
• sometimes just coffee, depending on the situation

That is perfectly normal in Croatian.

Sometimes learners notice that negation in Croatian can affect the object, and yes, you may hear variation in some contexts. But in this sentence, sitniš is fine as it stands.

Also, sitniš is a masculine inanimate noun whose accusative singular looks the same as the nominative:

• sitniš = nominative
• sitniš = accusative

So even though the object is there after nemaš, the form does not visibly change.

For a beginner, the safest takeaway is simply:

• nemaš sitniš = you don’t have any change

and this is a normal, understandable structure.