Perniagaan itu bukan peruncitan; sebaliknya, perniagaan itu ialah pemborongan.

Because peruncitan and pemborongan are nouns, and bukan is normally used to negate nouns or noun phrases.

So:

• bukan peruncitan = not retail
• bukan guru = not a teacher
• bukan masalah saya = not my problem

By contrast, tidak is usually used with verbs and adjectives:

• tidak mahu = do not want
• tidak besar = not big

So in this sentence, bukan is the correct choice.

Sebaliknya means something like instead, rather, or on the contrary, depending on context.

In this sentence, it introduces the contrasting correction:

• not retail; instead, it is wholesale

It is a fairly formal and clear way to set up a contrast between two classifications.

A few rough English equivalents are:

• instead
• rather
• on the contrary

But in Malay, sebaliknya is often broader and simply signals a reversal or opposite statement.

Ialah is used to link a subject with a noun phrase that identifies or defines it.

Here:

• perniagaan itu = the business
• ialah pemborongan = is wholesale / is a wholesale business

So ialah fits well because the sentence is equating one noun phrase with another.

A useful rule of thumb:

• ialah: often before nouns / noun phrases
• adalah: often before adjectives or descriptive phrases

Examples:

• Dia ialah doktor. = He/She is a doctor.
• Keputusan itu adalah penting. = That decision is important.

In everyday Malay, people often omit ialah completely:

• Perniagaan itu bukan peruncitan; sebaliknya, pemborongan.

But the full version with ialah sounds more formal and explicit.

Repeating the noun is very normal in Malay, especially in formal writing or when the speaker wants clarity.

So:

• Perniagaan itu bukan peruncitan; sebaliknya, perniagaan itu ialah pemborongan.

This avoids any ambiguity and sounds neat and formal.

Malay does use pronouns, but it often prefers repetition more than English does. English would usually say it in the second clause, but Malay frequently repeats the noun instead.

A more compact version is possible, but the repeated noun is not wrong or unnatural in a formal sentence.

Itu literally means that, but in many sentences it works more like a definiteness marker, similar to the in English.

So perniagaan itu can mean:

• that business
• or simply the business, depending on context

Malay has no direct article system like a/an/the, so words like itu and ini often help specify which thing is being talked about.

In this sentence, itu tells us the speaker means a particular business already known in the conversation.

They are both business-category nouns:

• peruncitan = retail / retailing
• pemborongan = wholesale / wholesaling

So the sentence is contrasting two types of commercial activity.

Very roughly:

• runcit relates to retail, selling to end customers
• borong relates to wholesale, selling in bulk or to businesses

Malay often uses these longer noun forms in more formal or technical contexts.

They are derived nouns formed with Malay affixes.

peruncitan

This comes from runcit and the circumfix peN-...-an, which often forms nouns related to processes, fields, or activities.

• runcit = retail / small-scale sale
• peruncitan = retailing / the retail sector

pemborongan

This comes from borong with the same general noun-forming pattern.

• borong = wholesale / buy in bulk
• pemborongan = wholesaling / the wholesale sector

You do not always need to analyze every affix as a learner, but it helps to know that these longer forms are common in formal Malay and often name an activity, industry, or category.

Yes. Those are also natural ways to express the idea, especially in less formal language.

For example:

• Perniagaan itu bukan perniagaan runcit; sebaliknya, perniagaan borong.
• Itu bukan perniagaan runcit, tetapi perniagaan borong.

Compared with peruncitan and pemborongan:

• perniagaan runcit / perniagaan borong sounds more everyday and straightforward
• peruncitan / pemborongan sounds more formal, abstract, or category-based

So the original sentence has a more formal, written style.

Yes, it sounds fairly formal and written.

The clues are:

• sebaliknya
• ialah
• the abstract nouns peruncitan and pemborongan
• repetition of perniagaan itu

In casual speech, many speakers would probably choose something shorter, such as:

• Perniagaan itu bukan runcit, tetapi borong.
• Itu bukan perniagaan runcit; itu perniagaan borong.

So the original is correct and natural, but it belongs more to formal explanation, writing, or business description than casual conversation.

Yes, in many contexts you could replace sebaliknya with tetapi, but the nuance changes slightly.

• tetapi = but
• sebaliknya = instead / on the contrary / conversely

With tetapi, the sentence would simply contrast two statements:

• Perniagaan itu bukan peruncitan, tetapi pemborongan.

That is very natural and probably more common.

With sebaliknya, the contrast is a bit more deliberate and rhetorical, almost like saying:

• It is not X; rather, it is Y.

So both work, but sebaliknya feels more formal and emphatic.

Yes, it can be omitted in some contexts, especially if the meaning is already clear.

For example:

• Perniagaan itu bukan peruncitan; sebaliknya, pemborongan.

That is understandable, and Malay often allows this kind of ellipsis.

However, keeping perniagaan itu makes the structure more complete and formal:

• Perniagaan itu bukan peruncitan; sebaliknya, perniagaan itu ialah pemborongan.

So:

• with repetition = clearer, more formal
• without repetition = shorter, more economical

Both can work depending on style.

The punctuation reflects formal writing style.

Semicolon

The semicolon links two closely related clauses:

• first clause: Perniagaan itu bukan peruncitan
• second clause: sebaliknya, perniagaan itu ialah pemborongan

It shows a strong connection between the two statements.

Comma after sebaliknya

The comma is natural because sebaliknya is being used as a discourse marker at the start of the second clause.

So the punctuation helps readability, especially in formal prose.

In less formal writing, people might simply write:

• Perniagaan itu bukan peruncitan, tetapi pemborongan.

The original word order is the most natural for this formal sentence:

• Perniagaan itu bukan peruncitan; sebaliknya, perniagaan itu ialah pemborongan.

Malay word order is fairly flexible in some contexts, but not every rearrangement sounds equally natural.

For example, this is fine:

• Perniagaan itu bukan peruncitan tetapi pemborongan.

But a very literal reshuffling can sound awkward.

As a learner, it is safest to keep:

1. subject: perniagaan itu
2. negation + category: bukan peruncitan
3. contrast marker: sebaliknya
4. subject + copula + new category: perniagaan itu ialah pemborongan

That pattern is clear and idiomatic.