Saya simpan resit dan kotak telefon kerana jaminannya masih sah.

Both can be understood, but they differ in register.

• Saya simpan ... is common in everyday, conversational Malay.
• Saya menyimpan ... is more fully standard/formal.

So this sentence is natural, especially in speech or informal writing. If you want the safest formal version, use Saya menyimpan resit dan kotak telefon kerana jaminannya masih sah.

Malay verbs usually do not change form for tense the way English verbs do.

So simpan by itself does not mark present or past. Time is usually understood from:

• context
• time words such as semalam (yesterday), sekarang (now), esok (tomorrow)
• aspect words such as sudah, telah, akan, masih

Here, jaminannya masih sah gives a present-time reason, so the sentence is naturally understood as I’m keeping / I keep the receipt and phone box because the warranty is still valid.

In Malay, the main noun usually comes first, and the word that describes it comes after.

So:

• kotak telefon = phone box / box for the phone
• literally, the head noun is kotak (box), and telefon tells you what kind of box

This is very common in Malay:

• kedai buku = bookshop
• stesen minyak = petrol station
• lesen memandu = driving licence

Literally, it could look ambiguous at first, but context makes it clear.

In this sentence, because it talks about a receipt and a warranty, kotak telefon clearly means the phone’s packaging box.

For a public phone booth, Malay more often uses expressions like:

• telefon awam = public telephone
• pondok telefon = telephone booth

Jaminan means guarantee or warranty.

The ending -nya can mean things like:

• his/her/its
• or sometimes simply the, depending on context

So jaminannya here means:

• its warranty
• or the warranty for it

In this sentence, it refers to the phone/item being discussed.

Yes.

• jaminan is a broader word meaning guarantee/assurance/warranty
• waranti is a very common loanword used specifically for a product warranty

So in this context, both can work:

• jaminannya masih sah
• warantinya masih sah

Waranti can sound a bit more specifically like a product warranty.

Malay normally does not use articles like English a/an/the.

So:

• resit can mean a receipt or the receipt
• kotak telefon can mean a phone box or the phone box

The exact meaning depends on context.

If Malay wants to be more specific, it can add words like:

• itu = that / the
• ini = this
• sebuah = a / one (for certain singular countable nouns)

Yes, you can.

Both mean because, but:

• kerana is a bit more neutral or formal
• sebab is very common in everyday speech

So these are both natural:

• Saya simpan resit dan kotak telefon kerana jaminannya masih sah.
• Saya simpan resit dan kotak telefon sebab jaminannya masih sah.

• masih = still
• sah = valid, officially valid, in force

So masih sah literally means still valid.

The word sah is often used for things like:

• documents
• tickets
• licences
• visas
• contracts
• warranties

Because masih is an adverb-like word that usually comes before the verb or adjective it modifies.

So:

• masih sah = still valid
• masih ada = still exists / still there is
• masih hidup = still alive

That order is the normal Malay pattern.

Mostly from logic and context.

The sentence mentions:

• the receipt
• the phone box
• the warranty

In real life, the warranty is normally for the phone/item purchased, not for the receipt or the box. So Malay relies on context to make that clear.

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

• ... kerana jaminan telefon itu masih sah.
• ... kerana waranti telefon itu masih sah.

Yes. Malay often leaves possession implicit when it is obvious from context.

So resit here is understood as the receipt from my purchase, and kotak telefon as the phone’s box, even though that is not spelled out.

If you want to state possession clearly, you can say:

• resit saya = my receipt
• kotak telefon saya = my phone box / my phone’s box
• kotak untuk telefon saya = the box for my phone