Kupon diskaun itu saya simpan di dalam dompet supaya tidak hilang.

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

So:

• kupon diskaun itu = that discount coupon
• dompet ini = this wallet

This is different from English, where this/that comes before the noun.

Also, itu can sometimes feel a bit like the in English, depending on context. Here it points to a specific coupon already known in the conversation.

Kupon diskaun is a normal Malay noun phrase made of:

• kupon = coupon
• diskaun = discount

Malay often puts nouns together directly, where English might use a compound noun or sometimes of.

So:

• kupon diskaun = discount coupon
• kad kredit = credit card
• kedai buku = bookstore / book shop

There is no need for a separate linking word here.

The sentence begins with Kupon diskaun itu because the speaker is putting focus on the coupon.

So:

• Saya simpan kupon diskaun itu di dalam dompet... = more neutral, basic word order
• Kupon diskaun itu saya simpan di dalam dompet... = That discount coupon, I keep in my wallet...

This fronting is very common in Malay when the speaker wants to highlight the object or topic.

It is often treated as a kind of passive-like structure in Malay, often called passive type 2.

Compare:

• Saya menyimpan kupon diskaun itu. = active
• Kupon diskaun itu saya simpan. = object-fronted / passive type 2
• Kupon diskaun itu disimpan oleh saya. = passive type 1, more formal/stiff here

A useful pattern to remember is:

• when the object comes first
• and the agent is a pronoun like saya, awak, kami
• the verb often appears in its base form

That is why you get saya simpan, not saya menyimpan, in this structure.

In natural English, though, you would often still translate it actively: I keep that discount coupon...

Because of the sentence structure.

In a normal active sentence, you would usually say:

• Saya menyimpan kupon diskaun itu...

But in Kupon diskaun itu saya simpan..., the object has been moved to the front. In this pattern, the verb is normally left in the root form:

• buku itu saya baca
• surat ini awak tulis
• kupon diskaun itu saya simpan

So simpan is correct here.

All three are related, but they are not exactly the same.

• di dalam dompet = inside the wallet
• dalam dompet = in the wallet / inside the wallet
• di dompet = at/on the wallet, which is less precise if you really mean inside

di dalam emphasizes location inside something.

So in this sentence, di dalam dompet is very natural because a coupon is physically kept inside a wallet.

A quick breakdown:

• di = at/in/on
• dalam = inside
• di dalam = inside, in the interior of

Supaya means so that, in order that, or so that it will.

It introduces a purpose clause:

• saya simpan di dalam dompet supaya tidak hilang
• I keep it in my wallet so that it won’t get lost

Other examples:

• Saya tulis nombor itu supaya tidak lupa. = I write down the number so that I won’t forget.
• Dia datang awal supaya sempat. = He came early so that he would have enough time.

The subject is omitted because it is already clear from context.

In this sentence, tidak hilang refers to the coupon:

• supaya tidak hilang = so that it does not get lost

Malay often leaves out subjects, objects, or pronouns when they are understood.

If you wanted to make it more explicit, you could say something like:

• ...supaya kupon itu tidak hilang

But that is usually unnecessary here.

Hilang is the normal word here. It means lost, go missing, or disappear.

So:

• tidak hilang = not get lost / not go missing

Kehilangan is a different form and usually means loss or to lose something/someone, depending on context. It would not fit naturally here.

Examples:

• Kunci saya hilang. = My key is lost / My key went missing.
• Saya kehilangan kunci saya. = I lost my key.

In your sentence, the coupon is the thing that might become lost, so hilang is the right word.

Here simpan means keep, store, or put away safely.

In this sentence, saya simpan di dalam dompet means something like:

• I keep it in my wallet
• I store it in my wallet
• I put it in my wallet for safekeeping

Sometimes simpan can be translated as save, but not always. It depends on context.

For example:

• simpan duit = save money
• simpan baju dalam almari = keep clothes in the cupboard
• simpan rahsia = keep a secret

So in this sentence, keep is usually the most natural English idea.

A more basic active version would be:

• Saya menyimpan kupon diskaun itu di dalam dompet supaya tidak hilang.

That version is easier for beginners to analyze:

• Saya = subject
• menyimpan = active verb
• kupon diskaun itu = object
• di dalam dompet = location
• supaya tidak hilang = purpose clause

The original sentence is still very natural, but it uses a more advanced and very common Malay pattern where the object is brought to the front for emphasis.