Masukkan struk belanja itu ke dalam dompet supaya tidak hilang.

Masuk means to enter / to go in. It usually does not take a direct object.

Masukkan means put/insert something into something. It comes from masuk plus -kan, which makes it transitive here.

So:

• masuk = go in
• masukkan = put something in

In this sentence, the speaker is telling someone to put the receipt into the wallet, so masukkan is the correct form.

Related form:

• memasukkan = to put/insert
• masukkan! = put it in! / insert it!

Yes. Masukkan here is an imperative form, so the sentence is giving an instruction or command:

• Masukkan struk belanja itu ke dalam dompet ...
  = Put that receipt into the wallet ...

Indonesian often gives commands without stating you.

If you want to make it softer or more polite, you could say:

• Tolong masukkan struk belanja itu ke dalam dompet ...
  = Please put that receipt into the wallet ...

Struk means receipt.
Belanja usually means shopping or shopping/purchases.

So struk belanja means shopping receipt or simply receipt.

In this phrase, belanja is modifying struk, like a noun modifier:

• struk belanja = receipt from shopping / purchase receipt

Depending on region and context, Indonesians may also say nota for a receipt, but struk is very common.

In Indonesian, demonstratives like ini and itu usually come after the noun.

So:

• struk belanja itu = that shopping receipt
• dompet ini = this wallet

This is normal Indonesian word order. English puts that before the noun, but Indonesian usually puts itu after it.

The key difference is movement vs location.

• ke dalam dompet = into the wallet
  (ke shows movement toward/into something)
• di dalam dompet = in/inside the wallet
  (di shows location)

Because the action is putting the receipt into the wallet, ke dalam dompet is the correct choice.

Compare:

• Masukkan struk itu ke dalam dompet.
  = Put the receipt into the wallet.
• Struk itu ada di dalam dompet.
  = The receipt is in the wallet.

Yes, in many everyday contexts, ke dompet would also be understandable:

• Masukkan struk belanja itu ke dompet ...

But ke dalam dompet is more explicit and clearly means into the inside of the wallet.

So:

• ke dompet = to the wallet / into the wallet, depending on context
• ke dalam dompet = into the wallet, very clearly

The version with ke dalam sounds a bit more precise.

Supaya means so that or in order that.

It introduces the purpose of the action:

• Masukkan struk belanja itu ke dalam dompet supaya tidak hilang.
  = Put that receipt into the wallet so that it doesn’t get lost.

Other similar words are:

• agar = so that, in order that
  Slightly more formal or neutral
• biar = so that / let
  More colloquial in many contexts

So supaya is very natural here.

Because Indonesian often omits pronouns when the meaning is already clear from context.

In English, we usually say so that it doesn’t get lost.
In Indonesian, you can simply say:

• supaya tidak hilang

The understood subject is whatever makes sense from the context — here, most naturally the receipt.

This kind of omission is very common in Indonesian and is perfectly natural.

Hilang can cover several related ideas:

• be lost
• go missing
• disappear

In this sentence, the natural meaning is:

• supaya tidak hilang = so it doesn’t get lost

So hilang is a broad word, and the exact English translation depends on context.

Examples:

• Kunci saya hilang. = My key is lost / My key went missing.
• Rasanya hilang. = The feeling disappeared.

Grammatically, Indonesian often leaves that unstated, but in this sentence the most natural interpretation is the receipt.

So the meaning is:

• Put the receipt into the wallet so the receipt doesn’t get lost.

In theory, you could imagine another interpretation, but context strongly points to the receipt.

If someone wanted to make it more explicit, they could say:

• ... supaya struk itu tidak hilang.
  = ... so that the receipt doesn’t get lost.

Yes, it is very natural.

The structure is:

• Masukkan = command verb
• struk belanja itu = object
• ke dalam dompet = destination/place moved into
• supaya tidak hilang = purpose clause

So the sentence is built in a very standard way: Verb + object + destination + purpose

A slightly different but still natural version would be:

• Masukkan struk belanja itu ke dompet agar tidak hilang.

That means basically the same thing.

Yes, but the nuance changes a little.

• masukkan = put/insert into
• simpan = keep/store/put away

So:

• Masukkan struk belanja itu ke dalam dompet ...
  focuses on the action of putting it in
• Simpan struk belanja itu di dalam dompet ...
  focuses more on keeping/storing it there

Both are natural, but masukkan matches the physical action especially well.

Struk is pronounced roughly like strook, but with a short, crisp Indonesian u sound.

A simple approximation for English speakers is:

• struk ≈ strook

The r is usually tapped or lightly rolled in Indonesian accents, though pronunciation varies by speaker.

The word is adapted from Dutch influence in Indonesian vocabulary, which is one reason it may look a little unusual to English speakers.