Die muurverf droog vinniger deurdat die venster oop is.

Muurverf means wall paint.

It is a compound noun:

• muur = wall
• verf = paint

Afrikaans, like Dutch and German, very often writes compound nouns as a single word. So where English has wall paint, Afrikaans commonly has muurverf.

Both instances of die mean the.

In this sentence:

• die muurverf = the wall paint
• die venster = the window

Afrikaans uses die as the definite article for both singular and plural nouns, so unlike English, there is no separate form to worry about.

Because droog can be either:

• an adjective: dry
• a verb: to dry / dries

In this sentence, droog is a verb:

• Die muurverf droog = The wall paint dries

Afrikaans present-tense verbs usually do not change form depending on the subject, so:

• ek droog
• jy droog
• dit droog

The form stays droog.

Vinniger means faster.

It is the comparative form of vinnig = fast / quickly.

Formation:

• vinnig = fast
• vinniger = faster

This is similar to English fast → faster. In Afrikaans, many comparatives are formed with -er.

Because the sentence is making a comparison: the paint dries more quickly under this condition.

So:

• vinnig = fast / quickly
• vinniger = faster / more quickly

Even if the comparison is not stated explicitly with than, Afrikaans still uses the comparative when the idea is faster than usual or faster because of something.

Deurdat means something like:

• because
• due to the fact that
• as a result of the fact that
• sometimes by the fact that

In this sentence, it introduces the reason or circumstance:

• deurdat die venster oop is = because the window is open

A useful nuance: deurdat often suggests that something happens through or by means of a certain circumstance. It can sound a bit more formal or explanatory than plain omdat.

Yes, very often you could say:

• Die muurverf droog vinniger omdat die venster oop is.

That would also mean The wall paint dries faster because the window is open.

The difference is mainly nuance:

• omdat = the normal everyday because
• deurdat = often emphasizes the mechanism, means, or resulting circumstance

So deurdat is not wrong at all here, but it can sound slightly more formal or more focused on how this causes the result.

Because deurdat introduces a subordinate clause, and in Afrikaans subordinate clauses usually send the finite verb to the end.

Compare:

Main clause:

• Die venster is oop. = The window is open.

Subordinate clause after deurdat:

• ... deurdat die venster oop is.

So the pattern is:

• conjunction
• subject
• the rest
• finite verb at the end

This is a very important Afrikaans word-order rule.

For the same word-order reason: in the subordinate clause, the finite verb is moves to the end.

So:

• main clause: Die venster is oop
• subordinate clause: die venster oop is

Here oop is a predicate adjective, meaning open.

Yes. Oop is an adjective meaning open.

In:

• die venster oop is

the word oop describes the state of the window.

So the structure is basically:

• the window open is

which is the subordinate-clause version of:

• the window is open

Because it is being used predicatively, not directly before a noun.

Compare:

• Die venster is oop. = The window is open.
  Here oop stays plain.

But before a noun, many Afrikaans adjectives may change:

• ’n oop venster = an open window

In this sentence, oop comes after the noun as part of is oop, so it stays in its basic form.

Afrikaans often uses the simple present where English might use either:

• dries
• is drying

So:

• Die muurverf droog can mean The wall paint dries or The wall paint is drying, depending on context.

In a general statement like this, English often prefers dries faster, and Afrikaans naturally uses the simple present droog.

It can be understood as either, depending on context.

Afrikaans simple present is flexible. It can describe:

• a general fact: Wall paint dries faster when the window is open
• a current situation: The wall paint is drying faster because the window is open

Without extra context, the sentence can support both readings.

In a normal Afrikaans main clause, the finite verb usually comes in the second position.

Here the main clause is:

• Die muurverf droog vinniger

So:

1. Die muurverf = first element
2. droog = finite verb in second position
3. vinniger = rest of the clause

Then the subordinate clause follows:

• deurdat die venster oop is

This is a core word-order rule in Afrikaans.

Usually muurverf refers to paint for walls, the substance/product itself.

Depending on context, it could refer to the paint layer on the wall, but the most natural reading is the material: wall paint.

So in this sentence, it most likely means the paint that has been applied and is drying.

It is one word: deurdat.

You should learn it as a fixed conjunction. It introduces a subordinate clause, just like omdat.

So write:

• deurdat die venster oop is

not as two separate words.

Yes. Afrikaans allows different word orders for emphasis, but the verb rules still apply.

For example:

• Deurdat die venster oop is, droog die muurverf vinniger.

This means the same thing:

• Because the window is open, the wall paint dries faster.

Notice what happens in the main clause after the fronted subordinate clause:

• droog still comes before the subject die muurverf

That is because the finite verb must stay in second position in the main clause.

Probably these three:

1. Compound nouns

   • muurverf = wall paint

2. Comparatives

   • vinnig → vinniger

3. Subordinate clause word order

   • main clause: Die venster is oop
   • subordinate clause: ... dat die venster oop is

If you understand those three things, this whole sentence becomes much easier to read.