Die rede is duidelik, naamlik die koste.

Die is the Afrikaans definite article, equivalent to English the.

It appears twice because there are two definite nouns:

• die rede = the reason
• die koste = the cost / the costs / the expense

A useful thing to remember is that Afrikaans uses die for:

• singular nouns
• plural nouns
• all genders

So unlike some other languages, you do not have to learn different forms like the for masculine, feminine, or plural.

Because duidelik is being used after the verb is, as a predicative adjective.

In Afrikaans, adjectives usually stay in their basic form when they come after a linking verb like is:

• Die rede is duidelik. = The reason is clear.

But when an adjective comes before a noun, it often takes -e:

• die duidelike rede = the clear reason

So:

• is duidelik ✅
• die duidelike rede ✅

Naamlik means namely, that is to say, or more specifically.

It introduces a clarification or precise identification of what was just mentioned.

So in this sentence:

• Die rede is duidelik = The reason is clear
• naamlik die koste = namely the cost / specifically, the cost

It is not adding a new sentence idea. It is narrowing down or identifying the reason more precisely.

The comma shows that naamlik die koste is an explanatory addition.

This works much like English:

• The reason is clear, namely the cost.

In Afrikaans, naamlik is often set off with a comma when it introduces extra clarification.

So the comma helps the reader understand that the second part is not a new full clause, but an explanation of the first part.

That is a very good question, because koste often looks plural to English speakers.

In Afrikaans, koste usually means costs or expense, but it can also function as a more general abstract idea like the cost in English.

So in this sentence, die koste can naturally be understood as:

• the cost
• the expense
• sometimes the costs, depending on context

Even if English uses singular cost, Afrikaans may still use koste in this broad, collective sense.

Because naamlik die koste is not a full clause. It is just an explanatory phrase.

The full clause is:

• Die rede is duidelik

Then naamlik die koste is added to explain what that reason is.

So this is similar to English:

• The reason is clear, namely the cost.

You do not need another verb because naamlik die koste is functioning as a clarification, not as a separate sentence.

Yes, it is completely normal.

In a basic Afrikaans main clause, the finite verb usually comes in second position:

• Die rede = subject
• is = verb
• duidelik = complement

So:

• Die rede is duidelik

That is standard main-clause word order.

The phrase after the comma does not change that, because it is just an added explanation.

Yes. A native speaker might express the same idea in several ways, depending on style and emphasis.

For example:

• Die rede is duidelik: die koste.
• Die rede is die koste.
• Dit is duidelik dat die rede die koste is.
• Die rede is eenvoudig die koste.

Your original sentence sounds a bit formal or written, especially because of naamlik. It is correct, but in everyday speech people might choose a simpler structure.

No. Naamlik does not mean because.

Here is the difference:

• want = because / for
• omdat = because
• naamlik = namely / specifically

So:

• Ek gaan nie, want ek is moeg. = I’m not going because I’m tired.
• Die rede is duidelik, naamlik die koste. = The reason is clear, namely the cost.

Naamlik identifies or specifies; it does not itself express cause in the same way because does.

A rough English-friendly guide would be:

• duidelik ≈ DOY-duh-lik
• naamlik ≈ NAAM-lik

A few helpful notes:

• ui in Afrikaans is a special vowel sound that English does not have exactly, but DOY is a useful approximation.
• aa in naamlik is a long ah sound.
• The final -lik is often pronounced more lightly than an English speaker might expect.

These are only approximations, but they are good enough to get you started.

It sounds mostly neutral to somewhat formal, especially because of naamlik.

In written Afrikaans, this kind of phrasing is very natural. In everyday casual speech, people may be more likely to say something simpler, such as:

• Die rede is die koste.
• Dis oor die koste.
• Die koste is die rede.

So the sentence is correct and natural, but it leans a little more toward careful or formal wording than relaxed conversation.