Kalau antrean di bagian imigrasi terlalu panjang, kami menunggu dengan sabar.

Here, kalau introduces a condition, so it most naturally means if.

• Kalau antrean ... terlalu panjang = If the queue ... is too long
• In everyday Indonesian, kalau is very common in speech and writing.
• Depending on context, kalau can sometimes feel closer to when or whenever, but in this sentence the idea is clearly conditional: if that situation happens, then we wait patiently.

A more formal alternative is jika, but kalau sounds very natural and conversational.

Indonesian often leaves out the verb to be when a noun is followed by an adjective or another noun.

So:

• antrean ... terlalu panjang literally looks like queue ... too long
• but it means the queue ... is too long

This is very normal in Indonesian. You do not need a separate word like is here.

Compare:

• Dia lelah = He/She is tired
• Tempat ini ramai = This place is crowded
• Antrean itu panjang = That queue is long

Antrean means queue or line.

You may also see antrian, which is very common in everyday use. However:

• antrean is the standard form in modern formal Indonesian
• antrian is widely used and understood, especially in casual contexts

So if you are learning standard Indonesian, antrean is the form to remember, but don’t be surprised when native speakers write or say antrian.

Literally, di bagian imigrasi means at the immigration section/part.

Breakdown:

• di = at / in
• bagian = part / section
• imigrasi = immigration

So the phrase refers to the immigration area, desk, section, or checkpoint, depending on the situation.

In natural English, you might translate it more smoothly as:

• at immigration
• in the immigration section
• at the immigration counter/area

No. This di is a preposition, not a verb prefix.

Here:

• di bagian imigrasi = at/in the immigration section

Because it is a preposition, it is written as a separate word.

This is different from the passive prefix di-, which attaches directly to a verb:

• dibuka = opened
• ditutup = closed
• ditunggu = waited for

So:

• di bagian = correct
• dibagian = incorrect in this sentence

This is a very common spelling point for learners.

Because panjang describes the length of the line, while lama describes time or duration.

In this sentence:

• antrean ... terlalu panjang = the queue is too long
• it focuses on the line being long

If you wanted to talk about the waiting taking a long time, you would use lama instead:

• Menunggunya lama = The waiting takes a long time
• Kami menunggu lama = We wait for a long time

So:

• panjang = long in size/length
• lama = long in time

This is an important distinction in Indonesian.

• kami = we, but not including the listener
• kita = we, including the listener

So kami menunggu means we wait, but the person being spoken to is not part of that we.

If the speaker wanted to include the listener, they would say:

• kita menunggu

English uses we for both, but Indonesian makes the distinction clearly.

Menunggu is the normal active verb form meaning to wait or to wait for.

It comes from the root:

• tunggu = wait

With the meN- prefix, it becomes:

• menunggu = to wait / to wait for

In a full sentence, menunggu is the standard form:

• Kami menunggu = We wait

Using just tunggu usually sounds like:

• a command: Wait!
• a dictionary/root form
• or an informal shortened style in some contexts

So in a normal declarative sentence, menunggu is the expected form.

Not necessarily. Menunggu can be used:

• with an object: Kami menunggu petugas itu = We are waiting for that officer
• without an object, when the context is clear: Kami menunggu = We wait / We wait around

In your sentence, the object is not stated. The meaning is simply that we wait patiently if the immigration line is too long.

Depending on context, it could imply:

• waiting in line
• waiting for the queue to move
• waiting for their turn

Indonesian often leaves such details unstated if they are obvious from the situation.

Literally, dengan sabar means with patience or in a patient way.

Breakdown:

• dengan = with
• sabar = patient / patience, depending on use

Together, the phrase functions adverbially, so in natural English it becomes:

• patiently

This is a very common Indonesian pattern:

• dengan cepat = quickly
• dengan hati-hati = carefully
• dengan sabar = patiently

So even though Indonesian is not using a special -ly adverb form, the meaning works the same way.

Yes, the order can be changed, but the version with the kalau clause first is very natural.

Current order:

• Kalau antrean di bagian imigrasi terlalu panjang, kami menunggu dengan sabar.

You could also say:

• Kami menunggu dengan sabar kalau antrean di bagian imigrasi terlalu panjang.

Both are understandable. The difference is mostly about emphasis:

• putting the kalau clause first highlights the condition first
• putting kami menunggu dengan sabar first highlights the main action first

The comma is commonly used when the conditional clause comes first.

Indonesian does not use articles like English a, an, and the.

So:

• antrean can mean a queue or the queue
• bagian imigrasi can mean an immigration section or the immigration section

The exact meaning depends on context.

If a speaker wants to make something more specifically identifiable, they might add a word like itu:

• antrean itu = that queue / the queue
• bagian imigrasi itu = that immigration section

But in many cases, Indonesian simply leaves the noun without an article, and context does the job.

Yes, it is natural and correct.

It sounds clear and normal, especially in standard Indonesian. A native speaker might also say slightly different versions depending on style, for example:

• Kalau antrean imigrasi terlalu panjang, kami menunggu dengan sabar.
• Kalau antrean di imigrasi terlalu panjang, kami menunggu dengan sabar.

These versions are a little shorter, but your sentence is perfectly good. The choice of di bagian imigrasi just makes the location a bit more explicit.