Ja ti nisam dužan objašnjenje.

I don’t owe you an explanation.

Breakdown of Ja ti nisam dužan objašnjenje.

• ja: I
• biti: to be
• ti: you
• ne: not
• objašnjenje: explanation
• dužan: obliged

Questions & Answers about Ja ti nisam dužan objašnjenje.

Why is there a ti in the sentence, and what does it mean here?

Ti here is the unstressed (clitic) form of tebi and it’s in the dative case. It means to you.
So the core idea is: I am not obliged / I don’t owe (something) to you.

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Is ti the subject you, or is it to you?

It’s to you (dative), not the subject. The subject is ja (I).
Croatian uses case endings/pronouns rather than word order to show roles, so ti is an indirect object (recipient).

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Why does the sentence start with Ja? Can it be omitted?

Yes, ja can be omitted because the verb form nisam already shows 1st person singular.

• Neutral/common: Nisam ti dužan objašnjenje.
• With emphasis/contrast (like I’m not, maybe someone else is): Ja ti nisam dužan objašnjenje.

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Why is ti placed right after Ja?

Because ti is a clitic, and clitics in Croatian typically go in the second position of the clause (often called the “Wackernagel position”).
So: Ja + ti + nisam... is very natural.
You’ll also often see: Nisam ti dužan... (clitic still comes early).

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Why is it nisam and not ne sam?

Croatian forms negation of biti (to be) with special negative forms:

• sam → nisam
• si → nisi
• je → nije
  So nisam means I am not as a single word.

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What part of speech is dužan, and what does it literally mean?

Dužan is an adjective used predicatively with biti (sam/nisam). Literally it means owing / obliged.
In English you might translate it as (not) obliged or (don’t) owe depending on context.

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Does dužan change depending on who is speaking?

Yes—dužan agrees with the subject in gender and number:

• male speaker: (ja) nisam dužan
• female speaker: (ja) nisam dužna
• plural: (mi) nismo dužni / dužne (mixed/masc vs. all-fem)

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Why is it objašnjenje (nominative/accusative-looking form)? What case is it?

It’s accusative singular (and for neuter nouns like objašnjenje, nominative and accusative often look identical).
With dužan in this meaning (to owe something to someone), the thing owed is typically in the accusative:
dužan sam ti objašnjenje = I owe you an explanation.

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Could I also say Ja tebi nisam dužan objašnjenje?

Yes. Tebi is the stressed/strong form and adds emphasis (often contrastive):

• Ja ti nisam dužan objašnjenje. (neutral)
• Ja tebi nisam dužan objašnjenje. (more pointed: to you in particular)

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Is this sentence formal or informal? What if I’m speaking politely?

Ti is informal singular (you to a friend/peer/child). For polite or plural you, use vam:

• Nisam vam dužan objašnjenje.
  That will sound more appropriate in formal situations.

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Can the word order change, and what changes in meaning?

Yes, Croatian word order is flexible, but it affects emphasis:

• Nisam ti dužan objašnjenje. (most neutral/common)
• Ja ti nisam dužan objašnjenje. (emphasizes I)
• Objašnjenje ti nisam dužan. (emphasizes explanation)
  Clitics like ti still tend to stay very early.

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How does dužan differ from moram or trebam?

They don’t mean the same thing:

• (N)isam dužan = I’m (not) obliged / I (don’t) owe it (duty/obligation toward someone)
• (Ne) moram = I (don’t) have to (necessity/requirement)
• (Ne) trebam = I (don’t) need to / should (need/recommendation)
  So nisam ti dužan objašnjenje specifically frames it as no obligation owed to you.