Molim te, javi mi se kad dođeš kući.

Molim te means please when speaking to one person informally.

• molim = literally I ask / I beg
• te = you (accusative singular)

So the whole phrase is like I ask you → please.

It is polite, but it is also informal, because it uses te.
If you were speaking formally to one person, you would usually say Molim Vas.

Javiti se is a very common Croatian verb meaning:

• to get in touch
• to contact someone
• to let someone know
• to check in

In this sentence, javi mi se means something like:

• contact me
• let me know
• message/call me

It is broader than just call me. It could mean texting, calling, or otherwise contacting the person.

They do different jobs.

• mi = to me
• se = part of the verb javiti se

So:

• javiti se = to contact / to check in
• javiti mi se = to contact me

The se here is not easily translated word-for-word into natural English. Many Croatian verbs use se as part of their standard form.

A useful way to learn it is as a chunk:

• javiti se nekome = to get in touch with someone

So:

• javi mi se = get in touch with me

Javi is the imperative form, used for commands or requests.

The basic verb is javiti (se).
The imperative for ti (informal singular you) is:

• javi (se)! = contact me / get in touch!

So the sentence is giving a request:

• Molim te, javi mi se... = Please, contact me...

It is softer because of molim te, but grammatically it is still an imperative.

This is a very common thing in Croatian.

After words like kad (when), Croatian often uses a present-tense form to talk about a future event.

So:

• kad dođeš kući = literally when you come home
• but in English the natural translation is when you get home

Here dođeš is the present form of the perfective verb doći.

This is normal Croatian usage:

• Nazovi me kad stigneš. = Call me when you arrive.
• Javi se kad završiš. = Get in touch when you finish.

This is about aspect, which is very important in Croatian verbs.

• doći = to come / arrive as a completed event
• dolaziti = to be coming / to come regularly / repeatedly

In this sentence, the speaker means the moment you arrive home, a single completed event. That is why Croatian uses the perfective verb doći:

• kad dođeš kući = when you get home / when you arrive home

If you said kad dolaziš kući, it would usually mean something more like:

• when are you coming home? or it could suggest an ongoing/repeated action, not a one-time arrival.

Kući is the form used after verbs of movement when meaning home / to home.

The dictionary form is:

• kuća = house

But in the sentence:

• dođeš kući = you come home / you arrive home

Croatian uses kući, which is historically/grammatically a case form, but for learners it is easiest to remember as a fixed expression:

• ići kući = to go home
• doći kući = to come home
• vratiti se kući = to return home

So it is best to learn kući as the normal form used with movement toward home.

Yes.

• kad = when
• kada = when

They mean the same thing.
Kad is shorter and very common in everyday speech.
Kada can sound a bit more neutral, careful, or slightly more formal, depending on context.

So both are fine:

• Javi mi se kad dođeš kući.
• Javi mi se kada dođeš kući.

Croatian usually does not need subject pronouns if the verb ending already shows who the subject is.

Here:

• javi = imperative for informal singular you
• dođeš = you come/arrive

So ti is understood automatically.

You could add ti for emphasis, but normally it is unnecessary.

English needs you, but Croatian often leaves it out because the verb form already contains that information.

Because mi and se are clitics in Croatian. Clitics are short unstressed words that tend to go in a fixed position in the sentence.

In neutral word order, Croatian places them very early in the clause, and their order is fairly strict.

So the natural form is:

• javi mi se

not:

• javi se mi

For learners, it is best to memorize common patterns like:

• daj mi ga = give it to me
• reci mi = tell me
• javi mi se = get in touch with me

It is informal.

You can tell because of:

• te in molim te
• the imperative form aimed at ti (singular informal you)

A formal version would be:

• Molim Vas, javite mi se kad dođete kući.

That would be used for:

• one person you address formally
• or sometimes multiple people, depending on context

It can cover either one, depending on context.

Javi mi se is intentionally broad. It usually means:

• contact me
• let me know
• check in

So if the situation suggests a phone call, it can mean call me.
If the situation suggests messaging, it can mean text me.

If you want to be more specific, Croatian can say:

• Nazovi me kad dođeš kući. = Call me when you get home.
• Pošalji mi poruku kad dođeš kući. = Send me a message when you get home.

A simple approximation for an English speaker is:

MO-leem teh, YAH-vee mee seh kad DOH-jesh KOO-chee

A few sound notes:

• j is like English y in yes
• lj and nj are special Croatian sounds, but they do not appear here
• đ in dođeš sounds roughly like a soft j / dj, similar to the sound in duke in some English accents, but not exactly
• ć in kući is a soft ch-like sound

The stress patterns are hard to represent perfectly, but that approximation will be understood.

Yes, but the meaning shifts a little.

• javi mi se = get in touch with me / contact me
• javi mi = let me know / tell me

So:

• Javi mi se kad dođeš kući. = Contact me when you get home.
• Javi mi kad dođeš kući. = Let me know when you get home.

In everyday English, both might be translated similarly, but in Croatian the version with se sounds more like establishing contact, while the version without se focuses more on giving information.