Zašto se izvinjavaš?

Because izvinjavati se / izviniti se is a verb that normally comes with se.

In this sentence, se is not translated word-for-word as yourself. It is just part of how the verb to apologize works in Serbian.

So:

• izvinjavati se = to be apologizing / to apologize (imperfective)
• izviniti se = to apologize (perfective)

You should learn this verb together with se, not as just izvinjavati.

Izvinjavaš is:

• 2nd person singular
• present tense
• from the verb izvinjavati se

So it matches you in singular, informal speech:

• ja se izvinjavam = I apologize / I am apologizing
• ti se izvinjavaš = you apologize / you are apologizing
• on/ona se izvinjava = he/she apologizes

The ending -š is the clue that it means you.

In Serbian, subject pronouns are often omitted because the verb ending already shows who the subject is.

So Serbian usually says:

• Zašto se izvinjavaš?

rather than:

• Zašto se ti izvinjavaš?

Both are possible, but ti is only added for emphasis, contrast, or clarity.

For example:

• Zašto se ti izvinjavaš, a ne on? = Why are you apologizing and not him?

Grammatically, Serbian present tense can cover both a simple present and a present continuous meaning.

So Zašto se izvinjavaš? can mean:

• Why are you apologizing?
• Why do you apologize?

In most real situations, the more natural meaning is:

• Why are you apologizing?

Context tells you which one is meant.

Because se is a clitic, and Serbian clitics usually go near the beginning of the sentence, often in the second position.

So:

• Zašto se izvinjavaš? = correct

but:

• Zašto izvinjavaš se? = not natural / wrong in standard usage

This second-position behavior is very common in Serbian with short unstressed words like se, sam, si, je, ga, mu, and so on.

Zašto means why.

It introduces a question asking for a reason:

• Zašto kasniš? = Why are you late?
• Zašto se smeješ? = Why are you laughing?
• Zašto se izvinjavaš? = Why are you apologizing?

It is one of the most common Serbian question words.

They are related, but they differ in aspect.

• izvinjavati se = imperfective
• izviniti se = perfective

Very roughly:

• imperfective focuses on the process, repetition, or ongoing action
• perfective focuses on a completed act

That is why Zašto se izvinjavaš? uses the imperfective form: it sounds like Why are you apologizing?

Compare:

• Zašto se izvinjavaš? = Why are you apologizing?
• Zašto si se izvinio? = Why did you apologize? / Why have you apologized?

So the sentence you were given is about an ongoing or current apology, not a completed one.

A rough English-friendly guide is:

• Zašto ≈ ZAH-shto
• se ≈ seh
• izvinjavaš ≈ eez-veen-YAH-vash

A few helpful letter notes:

• ž sounds like the s in measure
• š sounds like sh
• j sounds like English y

So in izvinjavaš, the nj sounds like a soft ny sound.

You would use the plural/formal you form:

• Zašto se izvinjavate?

This can mean:

• Why are you apologizing? to one person formally
• Why are you apologizing? to more than one person

So:

• izvinjavaš = informal singular you
• izvinjavate = formal singular or plural you

Sometimes Serbian clitics can appear in slightly different positions depending on the full sentence structure, but in a simple question like this, se naturally comes right after the first word:

• Zašto se izvinjavaš?

That is the form learners should use.

If you add emphasis, the structure can still follow the clitic rule:

• Zašto se ti izvinjavaš? = Why are you apologizing?

So even there, se still stays near the front, before ti.

Yes. That version is correct too, but it is more emphatic.

Compare:

• Zašto se izvinjavaš? = neutral, ordinary
• Zašto se ti izvinjavaš? = Why are you apologizing? (with stress on you)

Native speakers often leave out ti unless they want contrast, emphasis, or emotional force.

Yes, very natural.

A native speaker could say it in situations like:

• someone apologizes even though they did nothing wrong
• someone says sorry repeatedly
• you are surprised that the other person is apologizing

It sounds normal, conversational, and idiomatic.