Kalau teh hangat sudah masuk ke termos, tinggal bawa ke kantor.

Yes, kalau often means if, but in this sentence it can sound more like once/when in natural English.

So Kalau teh hangat sudah masuk ke termos... can mean:

• If the warm tea is already in the thermos...
• Once the warm tea is in the thermos...
• When the warm tea has been put into the thermos...

In everyday Indonesian, kalau is very common and flexible. It does not always sound as conditional as English if.

In Indonesian, adjectives usually come after the noun.

So:

• teh hangat = warm tea
• air dingin = cold water
• kopi panas = hot coffee

This is the normal word order:

• teh = tea
• hangat = warm

So teh hangat literally follows the Indonesian pattern tea warm.

Sudah marks that something is already completed or has happened.

Here, sudah masuk ke termos means something like:

• is already in the thermos
• has already gone into the thermos
• has already been put into the thermos

It gives the idea that this step is finished, and then the next step can happen.

Good question. Literally, masuk means enter / go in, while dimasukkan means be put in / be inserted.

A more formal or explicit version might be:

• Kalau teh hangat sudah dimasukkan ke termos...

That clearly means if the warm tea has already been put into the thermos.

But in everyday Indonesian, people often use masuk in a looser, more natural way to mean that something has ended up inside something. So sudah masuk ke termos can naturally imply has already been put into the thermos, especially when the context makes it obvious.

So:

• masuk = more conversational, less explicit about who did it
• dimasukkan = more explicit passive form

It can mean to live or to stay, but here it has a different very common meaning.

In this sentence, tinggal means:

• just
• only need to
• all that remains is to

So tinggal bawa ke kantor means:

• just bring it to the office
• then you only need to take it to the office
• all that’s left is to bring it to the office

This use of tinggal is extremely common in instructions and step-by-step situations.

In everyday Indonesian, especially in speech and informal writing, the meN- prefix is often dropped.

So:

• membawa = to bring/carry
• bawa = bring/carry

After tinggal, using the shorter base verb is very natural:

• tinggal bawa ke kantor

A more formal version could be:

• tinggal membawa ke kantor

But that sounds a bit stiffer. The original sentence sounds natural and conversational.

Yes. The object is understood from context.

The sentence is talking about the thermos or possibly the tea in the thermos, depending on the situation. Indonesian often leaves out things that are obvious from context.

So tinggal bawa ke kantor really means something like:

• then just bring it to the office

The it is not stated, because the listener already knows what is meant.

Because Indonesian often omits subjects when they are clear from context.

In English, we usually need a subject:

• you just bring it to the office
• we just take it to the office

In Indonesian, it is very common to leave that unstated if the meaning is obvious. So tinggal bawa ke kantor sounds natural without saying who is doing the bringing.

Ke marks movement toward a destination, so ke kantor means to the office.

Compare:

• ke kantor = to the office
• di kantor = at/in the office

So here, because something is being brought somewhere, ke is the correct preposition.

It is fairly natural and conversational, leaning a bit informal because of forms like bawa instead of membawa and masuk instead of the more explicit dimasukkan.

A more formal version might be:

• Kalau teh hangat sudah dimasukkan ke termos, tinggal membawanya ke kantor.

That version is more complete and formal because it uses:

• dimasukkan instead of masuk
• membawanya instead of bawa

But the original sentence is very normal in everyday Indonesian.

Yes. Depending on the nuance, you could also hear:

• setelah = after
• begitu = once/as soon as
• kalau = if/when/once

For example:

• Setelah teh hangat masuk ke termos, tinggal bawa ke kantor.
• Begitu teh hangat masuk ke termos, tinggal bawa ke kantor.

But kalau is very common in speech and sounds natural. It can cover a range of meanings that English would split into if, when, or once.

Yes. Hangat usually means warm, not fully hot.

Compare:

• hangat = warm
• panas = hot

So:

• teh hangat = warm tea
• teh panas = hot tea

In real life, the exact temperature can depend on context, but grammatically hangat is definitely closer to warm than hot.