Jika saya guna kupon itu, saya boleh beli buku ini dengan harga diskaun.

Yes. Jika means if and introduces a condition.

In this sentence:

Jika saya guna kupon itu, ...
= If I use that coupon, ...

A useful note:

• jika is correct and slightly more formal/written
• kalau also means if and is very common in everyday speech

So a more conversational version would often be:

Kalau saya guna kupon itu, saya boleh beli buku ini dengan harga diskaun.

Both are natural, but jika sounds a bit more formal.

Guna means use, and it is very common in everyday Malay. In speech and informal writing, people often prefer guna because it is shorter and more natural.

So:

• guna = common, everyday
• menggunakan = more formal, more standard in careful writing

Both of these work:

• Jika saya guna kupon itu...
• Jika saya menggunakan kupon itu...

The sentence with guna sounds natural and normal in conversation.

Yes, Malay can sometimes leave it out if the meaning is clear, but repeating saya is perfectly normal.

Your sentence says:

Jika saya guna kupon itu, saya boleh beli buku ini ...

Malay often keeps the subject again in the main clause for clarity. This is very natural.

You may also hear:

Jika saya guna kupon itu, boleh beli buku ini dengan harga diskaun.

But that sounds more casual and less explicit. For learners, repeating saya is safer and clearer.

Here, boleh means something like can or be able to.

So:

saya boleh beli buku ini
= I can buy this book

Depending on context, boleh can also mean:

• permission: may
• possibility/ability: can / be able to

In this sentence, it expresses possibility or ability resulting from the condition. Because of the coupon, buying the book at a discount becomes possible.

Exactly. Boleh beli works like can buy.

Malay often puts a modal word such as boleh before the main verb:

• boleh beli = can buy
• boleh pergi = can go
• boleh guna = can use

So the structure is very similar to English:

• I can buy
• saya boleh beli

• ini = this
• itu = that

So in the sentence:

• kupon itu = that coupon
• buku ini = this book

Malay places these words after the noun, unlike English:

• buku ini literally = book this
• kupon itu literally = coupon that

That is normal Malay word order.

Because demonstratives in Malay usually come after the noun.

Compare:

• English: this book

• Malay: buku ini

• English: that coupon
• Malay: kupon itu

This is one of the basic word-order differences between English and Malay. So even though it feels reversed to an English speaker, it is completely normal.

Literally, dengan harga diskaun means something like with a discount price or at a discounted price.

Breakdown:

• dengan = with
• harga = price
• diskaun = discount

Malay often uses dengan in places where English might say:

• with
• at
• using
• by

So here, a natural English translation is:

• at a discount price
• at a discounted price
• with a discount

Yes, there are other possible ways to say this.

Common alternatives include:

• dengan harga diskaun
• pada harga diskaun
• dengan diskaun
• pada harga yang lebih murah depending on nuance

Of these, dengan harga diskaun is understandable and natural enough.
In everyday speech, many speakers might also say:

Jika saya guna kupon itu, saya boleh beli buku ini dengan diskaun.

That sounds a bit simpler and very natural too.

It is understandable and commonly used, especially in modern everyday Malay, but it does reflect a modern borrowing style.

You may also encounter:

• harga potongan
• harga promosi
• harga istimewa
• diskaun used on its own

In real life, diskaun is extremely common in shops, ads, and speech, so learners should definitely know it.

Malay does not use articles like English a, an, and the in the same way.

So:

• kupon can mean a coupon or the coupon, depending on context
• buku can mean a book or the book

In your sentence, itu and ini help make the meaning specific:

• kupon itu = that coupon
• buku ini = this book

Malay relies more on context and demonstratives than on articles.

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

So guna and beli do not themselves show past, present, or future.

The time is understood from context. In this sentence, because it is a conditional statement with if, English often interprets it as present/future:

If I use that coupon, I can buy this book at a discount.

Malay leaves that tense information more open unless extra time words are added, such as:

• sekarang = now
• nanti = later
• esok = tomorrow
• semalam = yesterday

Yes. The structure is very normal:

Jika + condition, main clause

So:

• Jika saya guna kupon itu, saya boleh beli buku ini dengan harga diskaun.

This is a standard and clear way to form a conditional sentence.

Malay conditionals are often quite straightforward:

• Jika hujan, saya tidak pergi. = If it rains, I’m not going.
• Kalau dia datang, saya beritahu awak. = If he comes, I’ll tell you.

A native speaker could say this, and it is understandable. But in everyday conversation, a slightly more natural version might be:

Kalau saya guna kupon tu, saya boleh beli buku ni dengan diskaun.

What changed:

• jika → kalau for a more conversational if
• itu → tu in casual speech
• ini → ni in casual speech
• dengan harga diskaun → dengan diskaun for a simpler everyday phrasing

So your original sentence is good, but it sounds a bit more careful or textbook-like than casual spoken Malay.