Kalau hujan deras, Ayah tetap ikut ronda malam di komplek kami.

Here, kalau means if:

• Kalau hujan deras = If it rains heavily / If there is heavy rain

It is very similar to jika, which also means if, but there is a difference in tone:

• kalau = more common in everyday speech
• jika = more formal, more common in writing or formal situations

So in natural conversation, kalau is very normal here.

In Indonesian, deras is an adjective meaning heavy or strong, and it comes after the noun it describes.

So:

• hujan deras = heavy rain
• literally: rain heavy

This is the usual Indonesian pattern:

• rumah besar = big house
• air dingin = cold water
• angin kencang = strong wind

So hujan deras is the normal word order.

It can suggest either idea depending on context.

In this sentence, Kalau hujan deras most naturally means:

• If it rains heavily
• or If there is heavy rain

Indonesian often does not need a separate word for it is in weather expressions. So hujan deras can work as a compact way to express the condition.

Ayah means father or dad.

It is capitalized here because it is being used like a name or title for a specific person, similar to how English might write Dad in a sentence like:

• Dad still goes...

If it were used more generally, it might not be capitalized:

• ayah saya = my father

But when directly referring to one’s father as a family title, capitalizing Ayah is common.

Tetap means still, nevertheless, or all the same.

So:

• Ayah tetap ikut... = Father still joins...
• more naturally: Father still takes part... anyway / even so

It shows that the action continues despite the heavy rain.

A useful way to feel the meaning is:

• Kalau hujan deras, Ayah tetap ikut...
• Even if it rains heavily, Dad still joins...

Because tetap functions like an adverb here, modifying the verb phrase.

Pattern:

• tetap + verb

So:

• tetap ikut = still join / still take part
• tetap pergi = still go
• tetap bekerja = still work

This is normal Indonesian word order.

Ikut literally means to join, to follow, or to take part.

In this sentence, it means:

• join
• take part in

So ikut ronda malam means:

• join the night patrol
• take part in the neighborhood night watch

A few examples:

• Saya ikut = I’m joining / I’m coming along
• Dia ikut rapat = He/She joins the meeting
• Mereka ikut lomba = They take part in the competition

Ronda malam refers to a night patrol or night watch, usually done by neighborhood residents for local security.

This is a cultural phrase as well as a vocabulary item:

• ronda = patrol
• malam = night

So:

• ronda malam = night patrol

In many Indonesian neighborhoods, residents may take turns doing this, especially in smaller communities or housing areas.

Di komplek kami means in our housing complex / in our neighborhood complex.

Breakdown:

• di = in / at
• komplek = housing complex, residential area
• kami = our

So the whole phrase tells you where the night patrol happens.

A note on spelling:

• komplek is a very common informal spelling
• kompleks is the standard spelling

Both are widely understood.

This is a very important Indonesian distinction.

• kami = we/us/our, excluding the person being spoken to
• kita = we/us/our, including the person being spoken to

So komplek kami means:

• our housing complex
• but not necessarily yours

If the speaker said komplek kita, that would suggest the listener is part of the same neighborhood.

No, nothing is missing. The sentence is natural as it is.

In Indonesian, ikut can directly take the activity:

• ikut ronda malam
• ikut rapat
• ikut kerja bakti

So ikut ronda malam simply means join the night patrol.

You do not need untuk here.

Indonesian allows both orders:

• Kalau hujan deras, Ayah tetap ikut ronda malam di komplek kami.
• Ayah tetap ikut ronda malam di komplek kami kalau hujan deras.

Both are possible.

Starting with Kalau hujan deras puts the condition first, which is very natural when the speaker wants to highlight the situation:

• If it rains heavily, Dad still joins...

This is similar to English.

Yes, in effect it can.

Strictly speaking:

• kalau = if

But when combined with tetap, the full meaning often feels like:

• even if it rains heavily, Dad still joins the night patrol

That stronger despite that condition feeling comes from tetap, not from kalau by itself.

It sounds mostly like natural everyday Indonesian.

Reasons:

• kalau is conversational and common
• komplek is a common everyday spelling and word choice
• Ayah also gives it a personal, family tone

A more formal version might be something like:

• Jika hujan deras, Ayah tetap ikut ronda malam di kompleks kami.

But the original sentence is very normal and natural in daily use.