Saya menyimpan SIM di dompet kecil agar tidak hilang.

No. In Indonesian, SIM here means Surat Izin Mengemudi, which is a driver’s license.

This is a very common point of confusion for English speakers, because in English SIM usually makes people think of a mobile phone card. In Indonesian, though, SIM often means driver’s license unless the context clearly points to phones.

Simpan is the root word, meaning to keep, to store, or to put away.

Menyimpan is the verb with the meN- prefix, which often forms an active verb in standard Indonesian. So:

• simpan = root
• menyimpan = to keep / to store / to put away

In a normal full sentence, Indonesian usually prefers the prefixed form:

• Saya menyimpan SIM... = I keep/store my driver’s license...

Using just simpan would sound more like:

• a command: Simpan! = Put it away!
• or a more casual/dictionary-like form

Indonesian often leaves things like a, the, and sometimes possessive words like my unstated when the meaning is clear from context.

So:

• SIM can mean a driver’s license, the driver’s license, or my driver’s license, depending on context.
• dompet kecil can mean a small wallet, the small wallet, or just small wallet in a general sense.

In this sentence, English naturally supplies my for SIM, because if I am storing a license, it is probably mine. But Indonesian does not need to say SIM saya unless the speaker wants to make ownership explicit.

Because in Indonesian, adjectives usually come after the noun.

So:

• dompet kecil = small wallet
• literally: wallet small

This is the normal word order in Indonesian:

• rumah besar = big house
• mobil baru = new car
• tas hitam = black bag

Here, di is a preposition meaning in, inside, or sometimes at, depending on context.

So:

• di dompet kecil = in the small wallet

A useful thing to remember is that this di is written separately because it is a preposition.

Compare:

• di dompet = in the wallet → preposition, written separately
• disimpan = is stored / is kept → passive prefix, written together

That spelling difference is very important in Indonesian.

Agar means so that, in order that, or so ... won’t ...

In this sentence:

• agar tidak hilang = so that it won’t get lost

It introduces the purpose of the action:

• Saya menyimpan SIM di dompet kecil agar tidak hilang.
• I keep my driver’s license in a small wallet so that it doesn’t get lost.

Other Indonesian words with a similar meaning include supaya. In many everyday contexts, agar and supaya are very close in meaning.

Literally, tidak hilang means not lost or not disappear.

In natural English, though, we often translate it as:

• so that it doesn’t get lost
• so it won’t be lost

Here:

• tidak = not
• hilang = lost / disappear / go missing

So the speaker is saying they keep the license in a small wallet to prevent it from going missing.

The implied subject is SIM.

Indonesian often omits subjects when they are already clear from context. So after:

• Saya menyimpan SIM di dompet kecil...

the phrase

• agar tidak hilang

is understood as:

• agar SIM itu tidak hilang
• so that the driver’s license doesn’t get lost

Indonesian does this very often, especially when repeating the noun would sound unnecessary.

Not exactly. Hilang usually means to be lost, to disappear, or to go missing.

So:

• SIM saya hilang = My license is lost / My license went missing

If you want to lose something, Indonesian often uses a different structure, such as:

• Saya kehilangan SIM saya = I lost my driver’s license

So a useful contrast is:

• hilang = something is lost / missing
• kehilangan = to lose something

Yes. In most everyday situations, supaya tidak hilang would sound natural and mean almost the same thing.

So both work:

• agar tidak hilang
• supaya tidak hilang

Very roughly:

• agar can sound a little more formal or written
• supaya is very common in everyday speech

But in this sentence, either is fine.

Sometimes learners try that, but agar is better here.

Why? Because agar introduces a purpose clause with its own predicate:

• agar tidak hilang = so that it won’t get lost

Untuk often works more like for or to before a noun or verb phrase, but in this sentence the intended meaning is more naturally expressed with agar or supaya.

So:

• Saya menyimpan SIM di dompet kecil agar tidak hilang. = natural
• ... untuk tidak hilang = less natural here

Yes, Aku is possible, but it changes the tone.

• Saya = neutral, polite, standard
• Aku = more informal, personal, intimate

So:

• Saya menyimpan SIM... sounds neutral and standard
• Aku menyimpan SIM... sounds more casual

For learners, saya is usually the safest default in general situations.

Not exactly, though they can overlap.

• menyimpan often means to keep, to store, to put away, especially with the idea of keeping something safe
• menaruh often means to put or to place

In this sentence, menyimpan is a good choice because the speaker is not just placing the license somewhere; they are keeping it there for safety.

Compare:

• Saya menaruh SIM di meja. = I put the license on the table.
• Saya menyimpan SIM di dompet kecil. = I keep/store the license in a small wallet.

The structure is:

• Saya = subject
• menyimpan = verb
• SIM = object
• di dompet kecil = location phrase
• agar tidak hilang = purpose clause

So the pattern is roughly:

Subject + Verb + Object + Location + Purpose

That gives:

• Saya
• menyimpan
• SIM
• di dompet kecil
• agar tidak hilang

This is a very common and natural Indonesian sentence pattern.