Sy is bang om die deur oop te sluit wanneer dit donker is.

In Afrikaans, om ... te is a very common way to introduce an infinitive phrase, especially after adjectives, nouns, and certain verbs.

Here, bang om ... te ... means afraid to ....

So:

• Sy is bang om die deur oop te sluit
  = She is afraid to unlock/open the door

A useful pattern to remember is:

• bang om te + verb = afraid to do something

For example:

• Ek is bang om te vra. = I am afraid to ask.
• Hy is bang om te gaan. = He is afraid to go.

So om and te work together here as part of the infinitive construction.

Because the dictionary form of the verb is oopsluit, which is a separable verb.

In Afrikaans, separable verbs often split in certain constructions. With te, the usual pattern is:

• oop te sluit
• toe te maak
• aan te steek

So:

• oopsluit = to unlock / open up
• om die deur oop te sluit = to unlock the door

This is not two unrelated words. It is one verb whose parts split because of the grammar.

Not exactly. Oopsluit usually means to unlock or to open by unlocking, often with a key or lock in mind.

That is a bit different from:

• oopmaak = to open
• oopsluit = to unlock / open up by unlocking

So in this sentence, the idea is probably not just pushing the door open, but opening it in the sense of unlocking it.

Because Afrikaans uses different patterns depending on what follows bang.

• bang vir + noun/pronoun = afraid of someone/something
• bang om te + verb = afraid to do something

Examples:

• Sy is bang vir honde. = She is afraid of dogs.
• Sy is bang om die deur oop te sluit. = She is afraid to unlock/open the door.

So vir is used before a thing or person, while om te is used before an action.

Because in Afrikaans infinitive phrases, the object normally comes before the infinitive verb.

So the structure is:

• om + object + verb
• here: om die deur oop te sluit

That is very normal Afrikaans word order.

Compare:

• om die boek te lees = to read the book
• om die venster oop te maak = to open the window
• om die deur oop te sluit = to unlock/open the door

For an English speaker, it may feel unusual because English puts the verb earlier, but Afrikaans usually keeps the object before the infinitive verb phrase.

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

So:

• wanneer dit donker is = when it is dark

But:

• Wanneer is dit donker? = When is it dark?

That second version is a question, so the word order changes.

A useful rule:

• Main clause question: Wanneer is dit donker?
• Subordinate clause: wanneer dit donker is

Here dit works like English it in expressions such as:

• it is dark
• it is late
• it is cold

It does not refer to a specific thing. It is just a grammatical subject.

So:

• dit is donker = it is dark
• dit is koud = it is cold
• dit is laat = it is late

This is very similar to English.

Wanneer means when. In this sentence it introduces the time situation in which she feels afraid.

• wanneer dit donker is = when it is dark

You may also hear as in everyday Afrikaans, and it can sometimes mean when or if depending on context. But wanneer is clearer and more specifically means when.

So:

• wanneer dit donker is = when it is dark
• as dit donker is can also occur in speech, but it may feel a little broader or more context-dependent

For a learner, wanneer is the safest choice when you clearly mean when.

Here Sy means she.

Afrikaans sy can be confusing because the same spelling can also appear in other contexts, such as the possessive his. But in this sentence:

• Sy is bang ...

it is clearly the subject pronoun she.

So the structure is:

• Sy = she
• is = is
• bang = afraid

Yes. In this sentence, bang is an adjective, and is is the verb to be.

So:

• Sy is bang = She is afraid

This is very similar to English, where afraid is also an adjective in She is afraid.

You can use bang with different forms of wees:

• Ek is bang. = I am afraid.
• Hy was bang. = He was afraid.
• Ons sal bang wees. = We will be afraid.

So bang itself does not change; the form of wees changes.

A helpful way to break it up is:

• Sy is bang
• om die deur oop te sluit
• wanneer dit donker is

So the structure is:

1. Sy is bang = main idea
2. om die deur oop te sluit = what she is afraid to do
3. wanneer dit donker is = when that fear applies

You can think of it as:

• She is afraid
• to unlock/open the door
• when it is dark

That kind of chunking often makes long Afrikaans sentences much easier to understand.