Naravno da mogu.

In Serbian, da often introduces a clause, similar to English that.

So Naravno da mogu is literally something like:

• Of course that I can

In natural English, we usually just say Of course I can and often leave out that, but in Serbian da is very common in this structure.

You will see the same pattern in sentences like:

• Znam da može. — I know that he/she can.
• Mislim da je dobro. — I think that it is good.

So here, da is not optional in the same way English that sometimes is. It is a normal part of the sentence pattern.

Because Serbian usually does not need an explicit subject pronoun when the verb already shows who is doing the action.

Mogu means I can, but it can also mean they can depending on context. In this sentence, the meaning is understood from the situation.

Serbian often drops subject pronouns like:

• Ja mogu — I can
• Mogu — also I can, with ja omitted

If you do include ja, it usually adds emphasis:

• Naravno da ja mogu. — Of course I can. / Of course I can.

So the version without ja sounds natural and normal.

Mogu is the 1st person singular present tense form of the verb moći, which means to be able to / can.

A few present-tense forms of moći are:

• ja mogu — I can
• ti možeš — you can
• on/ona/ono može — he/she/it can
• mi možemo — we can
• vi možete — you can (plural or formal)
• oni/one/ona mogu — they can

So in Naravno da mogu, the key verb is mogu = I can.

Yes.

All three are possible, but they feel slightly different:

• Naravno. — Of course.
• Mogu. — I can.
• Naravno da mogu. — Of course I can.

Naravno da mogu is fuller and more emphatic. It sounds like a direct response to doubt, a question, or a challenge.

For example:

• Možeš li to da uradiš? — Can you do that?
• Naravno da mogu. — Of course I can.

So the longer version adds confidence and emphasis.

Yes, usually at least somewhat.

Compared with plain Mogu, the phrase Naravno da mogu often sounds:

• more confident
• more reassuring
• sometimes slightly defensive, depending on tone

It can mean something like:

• Of course I can
• Why wouldn’t I be able to?

Tone matters a lot. Said warmly, it is friendly and reassuring. Said sharply, it can sound irritated.

Word order in Serbian is more flexible than in English, but not every variation sounds equally natural in every context.

The most natural version here is:

• Naravno da mogu.

Other orders may be possible in special contexts, but they usually change the emphasis or sound less neutral.

For example:

• Ja naravno mogu. — possible, but the emphasis is different
• Naravno, mogu. — also possible, with a pause; it feels more like Of course, I can
• Da mogu, naravno — usually does not sound like a normal equivalent of this sentence; it may sound incomplete or marked

So if you are learning the basic pattern, Naravno da mogu is the one to remember.

Because here da introduces a full clause, and that clause needs a finite verb.

So:

• da mogu = that I can

This is different from another common Serbian pattern where da replaces an infinitive, for example:

• Hoću da idem. — I want to go.
• literally: I want that I go

In Naravno da mogu, the meaning is not to be able as an infinitive phrase. It is a complete statement: that I can.

So mogu is in the present tense because it is part of a full clause.

Yes. Mogu can mean either:

• I can
• they can

This happens because the 1st person singular and 3rd person plural forms are the same.

You understand which one is meant from:

• context
• who is speaking
• any included pronoun

For example:

• Ja mogu. — clearly I can
• Oni mogu. — clearly they can
• Naravno da mogu. — most likely Of course I can, if said by one speaker about themselves

So context solves the ambiguity.

Yes. It is neutral and works in both.

It is not slang, and it is not especially formal either. You could use it:

• with friends
• at work
• in everyday conversation
• in polite responses

The level of formality depends more on the larger sentence and the situation than on this phrase itself.

A simple pronunciation guide is:

• Naravno ≈ nah-RAHV-no
• da ≈ dah
• mogu ≈ MOH-goo

A few helpful notes:

• Stress in naravno is on RA
• g in mogu is always a hard g, as in go
• Serbian pronunciation is generally quite phonetic, so words are usually pronounced close to how they are written

If you want to sound natural, try saying it smoothly as one unit:

• Naravno da mogu.

Yes, depending on intonation.

By itself, the words are not rude. But if spoken with a sharp or annoyed tone, it can sound like:

• Of course I can.
• Obviously I can.

That can feel impatient or offended.

So compare:

• warm tone: Naravno da mogu. — reassuring, friendly
• sharp tone: Naravno da mogu. — irritated, defensive

This is very similar to English, where Of course I can can be either kind or annoyed depending on how you say it.