Ons gebruik die modelleergereedskap.

Ons means we here.

A useful thing to know is that Afrikaans ons can mean both we and us, depending on its role in the sentence:

• Ons gebruik die modelleergereedskap. = We use the modelling tools/equipment.
• Hulle sien ons. = They see us.

In your sentence, ons comes before the verb and is the subject, so it means we.

Because Afrikaans verbs usually do not change according to the subject in the present tense.

So you get:

• ek gebruik = I use
• jy gebruik = you use
• hy gebruik = he uses
• ons gebruik = we use
• hulle gebruik = they use

This is much simpler than English, where you have I use but he uses. In Afrikaans, the same form gebruik is used with all these subjects.

This is the normal basic word order for a main clause: subject + verb + object.

So:

• Ons = subject
• gebruik = verb
• die modelleergereedskap = object

Afrikaans also follows the verb-second rule in main clauses. That means the finite verb usually appears in the second position. If the subject comes first, the order looks very similar to English:

• Ons gebruik die modelleergereedskap.

But if something else comes first, the verb still stays second:

• Vandag gebruik ons die modelleergereedskap. = Today we use the modelling tools/equipment.

Die means the.

One important difference from English learners’ expectations is that Afrikaans uses die for:

• singular nouns
• plural nouns
• all grammatical genders

So die does a lot of work. It can mean:

• the tool
• the tools
• the equipment

You have to use context and the noun itself to tell which meaning is intended.

Because Afrikaans commonly writes compound nouns as one word.

This is very normal in Afrikaans. The word is built from:

• modelleer = to model
• gereedskap = tools / equipment

Together, modelleergereedskap means modelling tools/equipment.

The last part, gereedskap, is the main noun, and the first part tells you what kind of tools/equipment it is. This is a very common Afrikaans pattern.

Because gereedskap often behaves like a collective or mass noun.

That means Afrikaans can use gereedskap to refer to a set of tools or equipment as a whole, even when English might prefer a plural like tools.

So depending on context, die modelleergereedskap could be understood as:

• the modelling equipment
• the modelling tools

This is not unusual. English does something similar with words like equipment, which is grammatically singular but can refer to many individual items.

Yes, you could, but the meaning changes slightly.

• Ons gebruik die modelleergereedskap. = We use the modelling tools/equipment
  This suggests specific tools/equipment, probably already known from the context.

• Ons gebruik modelleergereedskap. = We use modelling tools/equipment
  This sounds more general, as in talking about the kind of equipment you use.

So die makes the noun phrase definite, just like the in English.

A rough English-friendly guide would be:

mo-duh-LEER-ghuh-REET-skap

A few notes:

• modelleer has stress near the end: -LEER
• gereedskap has stress on REET
• the g sound in Afrikaans is usually a throaty sound, like the ch in Scottish loch or German Bach, not an English g

It may help to split it up first:

• modelleer
• gereedskap

Then say them together as one compound.

Yes. Modelleer is related to model and means to model.

Afrikaans often forms verbs and compounds from words that are recognisable to English speakers, although the spelling and pronunciation may differ. In this sentence, modelleer- is the descriptive part of the compound, telling you what kind of gereedskap it is.

So even if the full compound looks long, it becomes easier once you recognise the parts.