Kapan pun saya khawatir, saya menghubungi kakak perempuan saya.

Kapan pun means whenever or any time that.

So:

• kapan = when
• pun adds the sense of ever / no matter when

Together, kapan pun saya khawatir means whenever I’m worried.

A few comparisons:

• Kapan kamu datang? = When are you coming?
• Kapan pun kamu datang, saya siap. = Whenever you come, I’m ready.

In this sentence, it introduces a repeated or general situation, not just one specific moment.

In standard Indonesian, pun is often written separately when it functions like a particle meaning also, even, or giving an indefinite/general sense like -ever in English.

So:

• kapan pun = whenever
• siapa pun = whoever / anyone
• apa pun = whatever / anything

So yes, kapan pun as two words is normal and standard.

Indonesian usually does not use a verb like to be in the present tense the way English does.

So:

• saya khawatir literally looks like I worried
• but it naturally means I am worried

This is very common in Indonesian:

• Saya lelah. = I am tired.
• Dia marah. = He/She is angry.
• Mereka siap. = They are ready.

So saya khawatir is a perfectly normal way to say I’m worried.

In this sentence, khawatir is best understood as a state or adjective-like word meaning worried, concerned, or anxious.

That said, Indonesian word classes are often more flexible than in English. A word like khawatir can behave a bit like an adjective and still be translated naturally with an English verb phrase like to worry or to be worried.

Here, saya khawatir is most naturally:

• I am worried
• or I worry, depending on context

But in this sentence, I am worried fits best.

Because there are two clauses, and each clause has its own subject:

• Kapan pun saya khawatir = Whenever I’m worried
• saya menghubungi kakak perempuan saya = I contact my older sister

Indonesian often repeats the subject where English might also repeat it. Omitting the second saya is sometimes possible in conversation if the meaning is very clear, but repeating it is natural and clearer.

Also notice there is a third saya at the end:

• kakak perempuan saya = my older sister

So the three saya words have different roles:

1. subject of the first clause
2. subject of the second clause
3. possessor of kakak perempuan

Menghubungi means to contact, to get in touch with, or sometimes to call someone, depending on context.

In this sentence, it means:

• I contact my older sister
• or more naturally in English, I get in touch with my older sister

It does not have to mean only by phone. It can also mean contacting someone in general.

Examples:

• Saya menghubungi dia kemarin. = I contacted him/her yesterday.
• Silakan menghubungi kami. = Please contact us.

Because hubung is the root, and Indonesian often adds affixes to make a complete verb.

Here:

• root: hubung = connection/link
• meng- ... -i → menghubungi

This derived verb means to contact someone.

The ending -i often gives the sense that the action is directed toward an object or target. So menghubungi seseorang means to contact someone.

You may also see the command form:

• Hubungi saya. = Contact me.

That is the imperative form. But in a normal statement, menghubungi is the correct form.

Yes, basically.

• kakak = older sibling
• perempuan = female / woman
• kakak perempuan = older sister

Indonesian distinguishes older vs. younger siblings more naturally than English does:

• kakak = older sibling
• adik = younger sibling

If you want to specify gender:

• kakak perempuan = older sister
• kakak laki-laki = older brother
• adik perempuan = younger sister
• adik laki-laki = younger brother

So kakak perempuan saya literally is something like my female older sibling, but the natural English translation is my older sister.

Because possession in Indonesian is usually expressed as:

• noun + possessor

So:

• kakak perempuan saya = my older sister
• rumah saya = my house
• nama saya = my name

This is different from English, where the possessor often comes first:

• my house
• my name

In Indonesian, putting saya after the noun is the normal and standard pattern.

You could, but it would not mean exactly the same thing.

• kakak perempuan saya specifically means my older sister
• saudara perempuan saya means my sister / female sibling / female relative, depending on context, and sounds more formal or less specific

So if you want to clearly say older sister, kakak perempuan saya is the better choice.

The comma separates the introductory clause from the main clause:

• Kapan pun saya khawatir, = introductory clause
• saya menghubungi kakak perempuan saya. = main clause

This is similar to English:

• Whenever I’m worried, I contact my older sister.

The comma helps readability. In Indonesian, punctuation can be a little flexible in informal writing, but this comma is natural and correct.

Yes. You can also put the main clause first:

• Saya menghubungi kakak perempuan saya kapan pun saya khawatir.

This still means basically the same thing: I contact my older sister whenever I’m worried.

Putting kapan pun saya khawatir first gives a slightly more fronted, topic-setting feel, just like English Whenever I’m worried, ...

Both are grammatical.

Not exactly. They are related, but not the same.

• kapan pun = whenever
• kalau = if / when

Compare:

• Kapan pun saya khawatir, saya menghubungi kakak perempuan saya.
  = Whenever I’m worried, I contact my older sister.
  This suggests a general repeated habit.

• Kalau saya khawatir, saya menghubungi kakak perempuan saya.
  = If I’m worried, I contact my older sister.
  This can also work, but it sounds more like a conditional statement.

So kapan pun is a better match for whenever.

Yes. It sounds like a habitual or general action.

The structure:

• Whenever X happens, I do Y

usually describes something that happens regularly or characteristically.

So the sentence means that in general, when the speaker feels worried, their usual response is to contact their older sister.

Not always.

Menghubungi means to contact in a broad sense. It could mean:

• calling
• texting
• messaging
• emailing
• reaching out in some other way

If you want to be specific about calling by phone, Indonesian might use:

• menelpon
• menelepon
• telepon

But menghubungi is broader and more neutral.

Yes, the sentence is grammatical and natural.

That said, in everyday speech, some people might choose slightly different wording depending on style and context, for example:

• Kalau saya khawatir, saya menghubungi kakak saya.
• Kalau lagi khawatir, saya biasanya menghubungi kakak perempuan saya.

But the original sentence is perfectly good Indonesian and clearly expresses the idea.