Die terugstuurvorm vra vir die bestelnommer.

Because die means the in Afrikaans, and it is used for both nouns here:

• die terugstuurvorm = the return form
• die bestelnommer = the order number

Afrikaans does not change the for gender, so you always use die for definite singular and plural nouns in ordinary cases.

The first Die is capitalized only because it starts the sentence.

Terugstuurvorm is a compound noun, which is very common in Afrikaans.

It can be broken down like this:

• terug = back
• stuur = send
• vorm = form

So literally it is something like send-back form, which corresponds to return form in natural English.

Afrikaans often joins words together into one long noun where English might use two or three separate words.

Yes. Bestelnommer is also a compound noun:

• bestel = order
• nommer = number

So bestelnommer means order number.

This is another very typical Afrikaans pattern: instead of writing separate words, Afrikaans often combines them into one noun.

In this sentence, vra vir means ask for or request.

So:

• vra = ask
• vra vir = ask for

That is why Die terugstuurvorm vra vir die bestelnommer means that the form is asking for the order number.

This is a very useful pattern to remember:

• Ek vra vir hulp. = I am asking for help.
• Sy vra vir my naam. = She asks for my name.

So here the form is not asking a question in a general sense; it is requesting a piece of information.

The sentence follows normal Afrikaans main-clause word order:

Subject + verb + rest of the sentence

So here you have:

• Die terugstuurvorm = subject
• vra = verb
• vir die bestelnommer = prepositional phrase / what it asks for

So the structure is very close to English:

• The return form / asks / for the order number

That makes this sentence quite straightforward for English speakers.

Yes. Vir often corresponds to for, but its exact meaning depends on the construction.

In this sentence, after vra, it helps form the expression vra vir, meaning ask for.

In other contexts, vir can also mark the indirect object, especially in spoken Afrikaans:

• Ek gee dit vir hom. = I give it to him.

So vir is a very common word, and you learn its meaning by looking at the whole phrase, not just the single word by itself.

More or less, yes:

• Die = the
• terugstuurvorm = return form
• vra = asks
• vir = for
• die = the
• bestelnommer = order number

So the word-for-word translation is very close to natural English:

The return form asks for the order number.

This is one reason the sentence is fairly learner-friendly.

Because Afrikaans often expresses that idea by making one compound noun instead of using separate words.

English often uses:

• return form
• order number
• shipping address

Afrikaans very often turns these into single words:

• terugstuurvorm
• bestelnommer
• afleweringsadres

So if you are learning Afrikaans, it is a good habit to watch for compound nouns.

Yes. Just like in English, Afrikaans can use a verb like ask with something inanimate, such as a form, website, or document.

So Die terugstuurvorm vra vir die bestelnommer is perfectly natural and means the form requires or requests that information.

English does the same thing:

• The form asks for your address.
• The application asks for your ID number.

Afrikaans uses the same kind of personification here.

A rough English-friendly guide would be:

• Die ≈ dee
• terugstuurvorm ≈ tuh-RUUK-stuur-form
• vra ≈ frah or vrah with a rolled or tapped r depending on accent
• vir ≈ fur or a very light feer depending on speech style
• bestelnommer ≈ buh-STEL-nom-er

A few helpful notes:

• uu in stuur is a long vowel that does not exist exactly in English.
• g in terug is the guttural Afrikaans/Dutch-type sound, not an English g.
• Stress often falls on an early syllable in compounds, but natural pronunciation can vary a bit by speaker.

If you want, a good next step is to learn the sentence by chunks:

• Die terugstuurvorm
• vra vir
• die bestelnommer

That makes it easier to say smoothly.

Yes. ’n means a or an, while die means the.

So in another context you could say:

• ’n terugstuurvorm = a return form
• ’n bestelnommer = an order number

But in your sentence, die is used because it refers to a specific form and a specific order number.

So the choice between die and ’n works much like the versus a/an in English.