Die voorraadlys sluit die bestanddele in.

Because die is the definite article in Afrikaans, meaning the.

It appears twice because there are two definite nouns in the sentence:

• die voorraadlys = the inventory list / stock list
• die bestanddele = the ingredients

A useful thing to remember is that Afrikaans uses die for both singular and plural nouns:

• die bestanddeel = the ingredient
• die bestanddele = the ingredients

Unlike English, Afrikaans does not change the article for gender, and unlike some other languages, it does not have separate forms like masculine/feminine the.

Because sluit ... in is a separable verb pattern in this sentence.

The basic verb is insluit, meaning to include. In a main clause, Afrikaans often splits this kind of verb:

• sluit goes to the normal verb position
• in goes to the end

So:

• Die voorraadlys sluit die bestanddele in.

Compare that with the unsplit form you may see in other structures:

• Ek dink dat die voorraadlys die bestanddele insluit.

That final in is not a separate preposition here in the English sense of in; it is part of the verb meaning.

No. Even though sluit can mean close in some contexts, sluit ... in here means include.

So in this sentence, it has nothing to do with physically closing something.

For example:

• Die deur sluit. = The door closes.
• Die lys sluit suiker in. = The list includes sugar.

So you should learn sluit ... in / insluit here as a meaning unit: include.

Usually, no. Afrikaans verbs do not change much for person or number in the present tense.

So you get:

• Ek sluit
• Jy sluit
• Hy sluit
• Ons sluit
• Hulle sluit

That is much simpler than English, where we say I include but he includes.

So sluit stays the same whether the subject is singular or plural.

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

It is made up of:

• voorraad = stock / supplies / inventory
• lys = list

Together, voorraadlys means inventory list or stock list.

Afrikaans often writes these combinations as one word, where English may use two words. This is extremely common, so learners should get used to long compound nouns.

Yes, bestanddele is plural.

• singular: bestanddeel = ingredient / component
• plural: bestanddele = ingredients / components

In this sentence, it is plural because the sentence is talking about multiple ingredients.

Also note that the article stays die in both singular and plural:

• die bestanddeel
• die bestanddele

The sentence follows normal Afrikaans main-clause word order:

• Die voorraadlys = subject
• sluit = finite verb
• die bestanddele = object
• in = separated particle

So the pattern is basically:

Subject + verb + object + particle

This matches the common Afrikaans rule that the finite verb is in the second position in a main clause.

Often, yes, depending on the exact nuance.

• sluit ... in / insluit = includes
• bevat = contains

For many everyday sentences, both may sound natural:

• Die voorraadlys sluit die bestanddele in.
• Die voorraadlys bevat die bestanddele.

But there is a slight difference in feel:

• sluit ... in often suggests that something is part of a larger set or list
• bevat often stresses what something contains

So for a list, sluit ... in is very natural.

A rough English-friendly guide would be:

dee FOR-rahd-lays slout dee buh-STAHN-del-duh in

A few notes:

• die sounds like dee
• sluit is roughly like slout or sl-ate depending on accent, but not exactly like English
• bestanddele has stress near -stand-
• voorraadlys is one compound word, so say it smoothly as one unit

If you want to sound more natural, it helps to practice the rhythm of the whole sentence, not just each word separately.