Hulle praat oor hul huwelik.

A word-for-word breakdown is:

• Hulle = they
• praat = speak / talk
• oor = about
• hul = their
• huwelik = marriage

So the structure is very close to English: They talk about their marriage.

They are related, but they do different jobs:

• hulle is a subject pronoun: they
• hul is a possessive determiner before a noun: their

So:

• Hulle praat = They talk
• hul huwelik = their marriage

This is similar to English they vs their.

You may hear hulle huwelik in everyday speech, but in careful standard Afrikaans, hul is traditionally the form used before a noun:

• hul huwelik = standard their marriage

A useful learner rule is:

• hulle = they / them
• hul = their before a noun

So for learning and writing, hul huwelik is a good model.

Afrikaans verbs usually do not change according to the subject the way English verbs sometimes do.

Compare:

• Ek praat = I talk
• Jy praat = you talk
• Hy praat = he talks
• Hulle praat = they talk

The verb stays praat in all of these.

That is one of the nice simplifications in Afrikaans.

In this sentence, oor means about:

• praat oor iets = talk about something

But oor can also have other meanings depending on context, such as over or across.

Examples:

• Hulle praat oor die probleem. = They talk about the problem.
• Hy spring oor die muur. = He jumps over the wall.

So here, because it follows praat, oor is understood as about.

Yes. This sentence follows a very familiar pattern:

• Subject: Hulle
• Verb: praat
• Prepositional phrase: oor hul huwelik

So it lines up neatly with English:

• They
  • talk
    • about their marriage

That said, Afrikaans word order can change in some other sentence types, especially when another element is moved to the front:

• Oor hul huwelik praat hulle.

This is more marked and less neutral, but it shows that Afrikaans can shift word order for emphasis. The normal everyday order is the one in your sentence.

A simple learner-friendly guide:

• hulle: roughly HUL-uh
• hul: roughly hul
• huwelik: roughly HYOO-vuh-lik or HYOO-fuh-lik, depending on accent and how carefully it is spoken

A few pronunciation notes:

• The h is pronounced.
• ui in Afrikaans does not sound like English oo or ee; it is its own vowel sound and can take practice.
• The w in huwelik sounds more like English v.

If you want, you can think of huwelik as having three parts in speech: hu-we-lik.

Huwelik normally means marriage: the state of being married, or the marriage relationship.

So in your sentence:

• hul huwelik = their marriage

If you specifically mean the wedding ceremony, Afrikaans often uses:

• troue = wedding

So:

• Hulle praat oor hul huwelik. = They are talking about their marriage.
• Hulle praat oor hul troue. = They are talking about their wedding.

Yes. praat covers both talk and speak in many contexts.

So possible English translations include:

• They talk about their marriage.
• They are talking about their marriage.
• They speak about their marriage.

The exact English choice depends on context, but the Afrikaans sentence itself is straightforward.

Only when it appears at the beginning of a sentence, as it does here.

Compare:

• Hulle praat oor hul huwelik.
• Ek dink hulle praat oor hul huwelik.

So the capital letter is because it starts the sentence, not because the word itself is normally capitalized.