Kad dođe majstor, složit ćemo novi ormar u sobi.

Dođe is present tense, 3rd person singular, from the verb doći (to come / to arrive).

What can confuse English speakers is that Croatian often uses the present tense of a perfective verb to talk about a future event, especially after words like kad (when).

So in:

Kad dođe majstor...

the meaning is:

When the repairman/worker arrives...

not when he came.

A useful idea is:

• doći = perfective, one completed arrival
• dolaziti = imperfective, ongoing/repeated coming

Here, the sentence is about a single future arrival, so dođe is the natural choice.

Because doći and dolaziti express different aspects.

• doći = perfective → a single completed arrival
• dolaziti = imperfective → repeated, ongoing, or habitual coming

In this sentence, the speaker means:

When the worker arrives (once, in the future), we’ll assemble the new wardrobe.

That is a completed event, so Croatian prefers:

kad dođe

If you said kad dolazi, it would usually suggest something like:

• when he is coming
• when he usually comes
• or a different kind of situation depending on context

So kad dođe is the normal form for this sentence.

Croatian often drops subject pronouns when they are clear from the verb form.

In this sentence:

• dođe = he/she/it arrives
• ćemo = we will

So Croatian does not need to say:

• on for he
• mi for we

The full version could be:

Kad majstor dođe, mi ćemo složiti novi ormar u sobi.

But that sounds more explicit and is often unnecessary. In normal Croatian, the shorter version is more natural.

Both are possible, but they are formed a little differently.

Croatian future can appear as:

• ćemo složiti
• složit ćemo

Both mean we will assemble.

When the clitic form of htjeti (ću, ćeš, će, ćemo...) comes after the infinitive, the infinitive usually drops the final -i:

• složiti + ćemo → složit ćemo

So:

• ćemo složiti novi ormar
• složit ćemo novi ormar

are both correct.

In your sentence, složit ćemo is a very normal and natural choice.

Here složiti means to put together / assemble.

That is important because složiti can have different meanings depending on context, such as:

• arrange
• put in order
• stack
• compose
• assemble

With ormar (wardrobe / closet / cabinet), the natural meaning is:

assemble a new wardrobe

So this is probably talking about building or putting together furniture.

Majstor can mean several things depending on context. Common meanings include:

• craftsman
• repairman
• workman
• handyman
• technician
• sometimes even master in other contexts

In this sentence, majstor most likely means someone like a:

• furniture installer
• handyman
• repair worker
• skilled worker helping with the wardrobe

So a natural English translation here would usually be the handyman, the workman, or the repairman, depending on the situation.

Because novi ormar is the direct object of složit ćemo.

We are assembling what?
→ novi ormar

Since ormar is a masculine noun, and inanimate masculine nouns usually have the same form in the accusative as in the nominative, it stays:

• nominative: novi ormar
• accusative: novi ormar

So the form does not visibly change here, but grammatically it is functioning as the object.

Because u sobi means in the room as a location.

Croatian uses:

• u + locative for location: in
• u + accusative for motion toward something: into

So:

• u sobi = in the room
• u sobu = into the room

In your sentence, the wardrobe is being assembled in the room, so Croatian uses the locative:

u sobi

Kad means when.

It introduces a time clause:

Kad dođe majstor...
= When the worker arrives...

This sets up the condition in time for the main action:

...složit ćemo novi ormar u sobi.
= ...we’ll assemble the new wardrobe in the room.

So the structure is:

• subordinate clause: Kad dođe majstor
• main clause: složit ćemo novi ormar u sobi

Because Croatian normally separates this kind of introductory subordinate clause with a comma.

So:

Kad dođe majstor, složit ćemo novi ormar u sobi.

This is the same basic idea as English:

When the worker arrives, we’ll assemble the new wardrobe in the room.

The first part is a dependent clause, so the comma is standard.

Yes. Croatian word order is fairly flexible, although some versions sound more natural than others.

For example, you could also say:

• Kad majstor dođe, složit ćemo novi ormar u sobi.
• Novi ormar složit ćemo u sobi kad dođe majstor.
• Kad dođe majstor, novi ćemo ormar složiti u sobi.

These all keep roughly the same meaning, but the emphasis changes.

The original sentence is very natural and neutral:

Kad dođe majstor, složit ćemo novi ormar u sobi.

It presents the time condition first, then the main action.

In English, the best natural translation is usually:

When the worker arrives
or
When the worker comes

But the Croatian perfective verb dođe carries the idea of a completed arrival. So in meaning, it is closer to:

once the worker has arrived

Even though English usually does not need to translate it that explicitly.

So the Croatian nuance is:

• first, the arrival happens
• then, we assemble the wardrobe

It is about a one-time future event.

Several things show that:

• dođe is perfective → one completed arrival
• složit ćemo is future → a planned future action
• novi ormar suggests one specific wardrobe

If it were habitual, Croatian would probably use different wording, often with imperfective verbs and a different context.

So this sentence means something like:

Once the worker gets here, we’ll put together the new wardrobe in the room.