Die huuradvertensie is aanlyn.

Die is the definite article in Afrikaans, so here it means the.

Unlike English, Afrikaans does not change the article for gender, and it does not have different forms like the / a / an based on sound.
So:

• die huuradvertensie = the rental advertisement

Afrikaans often forms compound nouns by writing them as one word.

So huuradvertensie is made from:

• huur = rent / rental
• advertensie = advertisement

Together, huuradvertensie means rental advertisement or advertisement for a rental.

This is very common in Afrikaans. Where English often uses two words, Afrikaans frequently uses one compound word.

Yes, it is a normal kind of Afrikaans compound. Literally, it breaks down as:

• huur = rent / hire / rental
• advertensie = advertisement

So the literal sense is something like rental advertisement.

Depending on context, it could refer to an ad for a place to rent, or more generally an ad connected with renting.

This is standard Afrikaans word order for a main clause:

• Subject + verb + rest

So:

• Die huuradvertensie = subject
• is = verb
• aanlyn = complement/predicate

That matches English quite closely:

• The rental advertisement is online.

Mostly, yes. Is is the present-tense form of wees (to be) used with he/she/it and singular nouns.

So:

• Die huuradvertensie is aanlyn. = The rental advertisement is online.

Afrikaans present tense is simpler than English, because verbs do not change much for person in the present tense.

Aanlyn means online and functions here like an adjective or predicate complement after is.

In this sentence, it describes the state of the advertisement:

• The rental advertisement is online.

So aanlyn tells you where/how it is available or appearing.

In modern Afrikaans, aanlyn is usually written as one word. It is the standard spelling for online.

You may notice that it seems to come from:

• aan = on
• lyn = line

But as a normal modern word meaning online, it is treated as the single word aanlyn.

A rough guide for an English speaker:

• huur: something like heer but with a rounded vowel; depending on accent it may sound a bit like hyoor or heer
• advertensie: roughly ad-ver-TEN-see
• aanlyn: roughly AHN-layn

A few helpful pronunciation notes:

• aa in aanlyn is a long a sound
• ui does not appear here, so huur is easier than some Afrikaans words
• y in lyn sounds like the ei/ay sound in say or line, depending on the word; in lyn it is like line without the final n changing much

Pronunciation varies a bit by speaker, but that rough version will be understood.

In everyday speech, especially under English influence, some speakers may say or write online, but standard Afrikaans prefers aanlyn.

So if you are learning standard Afrikaans, use:

• Die huuradvertensie is aanlyn.

Yes, it can, but the meaning shifts slightly.

• Die huuradvertensie is aanlyn. = The rental advertisement is online.
• Die aanlyn huuradvertensie = The online rental advertisement.

In the original sentence, aanlyn is part of the predicate after is and tells you the current state of the ad.
Before the noun, it directly describes the noun itself.

In Afrikaans, yes/no questions usually put the verb first:

• Is die huuradvertensie aanlyn?

That means:

• Is the rental advertisement online?

This is very similar to English question formation.

Afrikaans typically uses double negation:

• Die huuradvertensie is nie aanlyn nie.

That means:

• The rental advertisement is not online.

The usual pattern is:

• nie after the verb or later in the clause
• another nie at the end

This is one of the most important grammar patterns in Afrikaans.

Yes, depending on context. Advertensie is a standard word for advertisement or ad. But in more everyday contexts, people may also use words influenced by English or shorter alternatives in speech.

Still, huuradvertensie is perfectly good Afrikaans and is clear and natural.

No. Afrikaans grammar is much simpler than many European languages in this respect.

In Die huuradvertensie is aanlyn:

• die does not change for masculine/feminine/neuter
• the noun does not change for case
• aanlyn does not agree with the noun

So the sentence stays nice and simple.