Jabuku sam ti već ogulila, pa je samo nareži na male komade.

Croatian has no articles, so there is no separate word for the or a/an.

So jabuku can mean an apple or the apple, depending on context. In this sentence, the context makes it clear that it means the apple.

Because jabuku is the accusative singular form of jabuka.

• jabuka = nominative singular, the basic dictionary form
• jabuku = accusative singular

Here the apple is the direct object of the verbs oguliti and narezati, so Croatian uses the accusative:

• Jabuka je na stolu. = The apple is on the table.
• Ogulila sam jabuku. = I peeled the apple.

Here sam is the 1st person singular auxiliary from biti = to be.

In Croatian past tense, you usually build the form with:

• the auxiliary sam / si / je / smo / ste / su
• plus the l-participle

So:

• sam ogulila = I peeled / I have peeled

Important: this sam does not mean alone here. It is just part of the past tense.

Croatian uses one past-tense form here where English might choose either:

• I peeled the apple
• I’ve peeled the apple

So Jabuku sam ti već ogulila can be translated naturally in more than one way depending on context.

The structure is:

• sam = auxiliary, I am in form but functioning as past-tense helper
• ogulila = past participle of oguliti = to peel

Together they make the standard past tense.

Because ogulila shows that the speaker is feminine.

In Croatian past participles agree with the subject in gender and number:

• ogulila = feminine singular
• ogulio = masculine singular
• ogulilo = neuter singular
• ogulili / ogulile = plural

So this sentence was said by a female speaker.
If a man said it, he would say:

• Jabuku sam ti već ogulio, pa je samo nareži na male komade.

Also, this agreement is with the speaker, not with jabuku.

Ti here is the unstressed dative pronoun meaning to you or for you.

So:

• Jabuku sam ti već ogulila = I already peeled the apple for you

This is very common in Croatian when someone does something for another person.

Compare:

• Ogulila sam jabuku. = I peeled the apple.
• Ogulila sam ti jabuku. = I peeled the apple for you.

If you wanted emphasis, you could use the full form tebi instead:

• Tebi sam već ogulila jabuku.

Croatian word order is much freer than English word order.

A big reason is that sam and ti are clitics: short unstressed words that tend to go near the beginning of the clause.

So in this sentence:

• Jabuku = first element, bringing the apple into focus/topic
• sam ti = clitic cluster near the beginning
• već = already
• ogulila = main participle

A very natural alternative would be:

• Već sam ti ogulila jabuku.

That version may feel more straightforward to an English speaker. Both are normal; they just differ a bit in emphasis and flow.

Već means already.

It adds the idea that the peeling is done before this moment, so now only the next step remains:

• Jabuku sam ti već ogulila = I’ve already peeled the apple for you

It helps set up the second clause:

• so now just cut it into small pieces

Here pa means something like:

• so
• and then
• so then

It links the two actions in a natural, conversational way:

• I already peeled the apple for you, so just cut it into small pieces.

Croatian pa is very common and can connect ideas a bit more loosely than English so.

Yes, je can mean is, but not here.

In this sentence, je is the unstressed accusative pronoun meaning it, referring back to jabuku.

So:

• pa je samo nareži = so just cut it

Why is it clear?

Because of the structure:

• nareži is the imperative verb
• je is functioning as the object of that verb

So this je means it, not is.

Also, many speakers would use ju here instead:

• pa ju samo nareži

That is also very common for feminine singular it/her in the accusative.

Nareži is the 2nd person singular imperative of narezati, which means to cut up / slice into pieces.

That fits the context perfectly: the apple is already peeled, and now someone should cut it into pieces.

The verb choice also involves aspect:

• rezati = imperfective, more like to be cutting / to cut in general
• narezati = perfective, to cut up completely / into pieces

Because this is a one-time completed action, nareži is the natural choice.

So:

• reži can sound more like cut! / keep cutting!
• nareži sounds like cut it up

Na male komade means into small pieces.

Literally, it is:

• na = onto / into, depending on context
• male = small
• komade = pieces

Here na + accusative expresses the result of the cutting: the apple ends up in small pieces.

Grammar details:

• komad = piece
• komade = accusative plural
• male agrees with komade in case, number, and gender

So the whole phrase means:

• cut it into small pieces

Because Croatian is a pro-drop language: subject pronouns are often omitted when the verb form already shows who the subject is.

In this sentence:

• sam tells you the first clause is I
• nareži tells you the second clause is an imperative addressed to you singular

So Croatian does not need ja or ti here.

If you add them, it usually gives emphasis or contrast:

• Ja sam ti već ogulila jabuku... = I peeled the apple for you...
• ...pa je ti samo nareži. = ...so you just cut it.

But in normal speech, leaving them out is more natural.