Rahang saya sakit.

Because Indonesian usually puts the possessor after the noun.

• rahang saya = my jaw
• literally: jaw my

This is the normal pattern for possession in Indonesian:

• buku saya = my book
• rumah saya = my house
• nama saya = my name

So rahang saya sakit is structured like:

• rahang saya = my jaw
• sakit = hurts / is sore / is painful

No, that is not natural Indonesian.

If you want to say my jaw, you say:

• rahang saya
• or rahangku

Putting saya before rahang does not express possession the way English my jaw does.

Rahang means jaw.

Depending on context, it can refer to the jaw area in general. If needed, Indonesian can be more specific:

• rahang atas = upper jaw
• rahang bawah = lower jaw

But by itself, rahang is simply jaw.

Here, sakit means something like:

• hurts
• is sore
• is painful

Sakit is a very common Indonesian word. Its exact English translation depends on context:

• Saya sakit. = I’m sick / ill.
• Kaki saya sakit. = My leg hurts.
• Gigi saya sakit. = My tooth hurts.

So with a body part, sakit often means hurting or painful, not necessarily sick.

Because Indonesian often does not use a copula like English is / am / are in simple sentences.

So:

• Rahang saya sakit. literally: My jaw painful/hurts.

This is completely normal Indonesian. You do not need to add a word for is here.

The same thing happens in many sentences:

• Dia marah. = He/She is angry.
• Rumah itu besar. = That house is big.
• Saya lapar. = I am hungry.

Yes. Rahangku sakit is correct and natural.

• rahang saya = my jaw
• rahangku = my jaw

The difference is mostly style and register:

• rahang saya sounds a bit more neutral or formal
• rahangku sounds more personal, casual, and compact

Both are good Indonesian.

Both can mean I / me / my, but they differ in formality.

• saya = more neutral, polite, formal
• aku = more casual, intimate

So you might hear:

• Rahang saya sakit. = polite/neutral
• Rahangku sakit. = casual
• Rahang aku sakit. = understandable, but less common than rahangku

In everyday speech, Indonesians often prefer -ku instead of aku after a noun.

Yes, it is natural and correct.

Other natural versions include:

• Rahangku sakit.
• Rahang saya terasa sakit. = My jaw feels sore/painful.

All of these are fine.
Rahang saya sakit is a simple, clear, standard sentence.

Normally, no. The standard order is:

• Rahang saya sakit.

Indonesian usually puts the subject first, then the description/state:

• Rahang saya = subject
• sakit = predicate

You might see different word orders in special contexts, poetry, or emphasis, but for normal learning and everyday use, Rahang saya sakit is the pattern to follow.

A simple approximation is:

• ra-hang

Notes:

• r is usually trilled or tapped
• h is pronounced
• ng sounds like the ng in song

So the end of rahang is not a hard g sound like in bag. It ends with the nasal ng sound.

Yes. English can translate Rahang saya sakit in a few ways depending on context:

• My jaw hurts.
• My jaw is sore.
• My jaw is painful.

Indonesian sakit covers a wider range than any single English word here, so the best translation depends on the situation.

Yes. In everyday speech, people often say:

• Rahangku sakit.
• Rahangku sakit banget. = My jaw really hurts.
• Rahang saya sakit nih. = conversational: My jaw hurts.

But for a textbook-style sentence, Rahang saya sakit is already perfectly good.