Sy weet nie of die rekening reeds betaal is nie.

Afrikaans normally uses double negation in full negative sentences.

So:

• Sy weet nie ... nie. = She does not know ...
• The first nie usually comes after the verb or the part being negated.
• The second nie usually comes near the end of the clause.

In this sentence:

• Sy weet nie = She does not know
• ... betaal is nie = closes the overall negation

This is one of the most important differences from English. In standard Afrikaans, you normally need both nies here.

Here of means whether, not or.

So:

• Sy weet nie of ... nie = She does not know whether ...

This can confuse English speakers because of looks like English of, but it is a completely different word.

Examples:

• Ek weet nie of hy kom nie. = I don’t know whether he is coming.
• Ons vra of dit reg is. = We ask whether it is correct.

Because after of, you get a subordinate clause, and in Afrikaans subordinate clauses typically send the finite verb to the end.

So instead of something more English-like such as:

• die rekening is reeds betaal

you get:

• of die rekening reeds betaal is

That end position is very normal in Afrikaans after words like:

• dat = that
• as = if/when
• omdat = because
• of = whether

So the pattern is not random; it is standard subordinate-clause word order.

Betaal is is a passive perfect-style construction here, meaning has been paid or is paid, depending on context.

So:

• die rekening is betaal = the bill/account is paid
• die rekening reeds betaal is = the bill/account has already been paid / is already paid

In this sentence, betaal functions as the past participle/main verbal part, and is is the auxiliary that goes to the end because of subordinate word order.

English learners often expect something closer to English word order, but Afrikaans places the auxiliary at the end in this kind of clause.

It can mean both, depending on context.

Common meanings of rekening include:

• bill
• invoice
• account

In this sentence, the most natural English translation is often:

• the bill
• or the account/invoice

If the context is paying money owed, bill or invoice is often the best choice.

Reeds means already.

So:

• reeds betaal = already paid

Yes, reeds and al can often both mean already, but they are not always identical in tone.

Very roughly:

• al is very common in everyday speech
• reeds can sound a bit more formal, careful, or written

So you might also hear:

• Sy weet nie of die rekening al betaal is nie.

That would also be natural.

Because Sy is the subject pronoun here.

• Sy = she
• Haar = her

Since she is the one doing the knowing, Afrikaans uses Sy.

Compare:

• Sy weet dit. = She knows it.
• Ek sien haar. = I see her.

So in your sentence, Sy is correct because it is the subject.

Die is the definite article, meaning the.

Afrikaans does not use grammatical gender the way languages like German do, and it does not change the for masculine, feminine, or neuter nouns.

So:

• die man = the man
• die vrou = the woman
• die rekening = the bill/account

That makes articles much simpler than in many other European languages.

In standard Afrikaans, no, not in this sentence.

The full standard form is:

• Sy weet nie of die rekening reeds betaal is nie.

Leaving off the last nie would sound incomplete or non-standard to most speakers.

Afrikaans double negation is a core grammar feature, so learners should get used to expecting that second nie.

The main clause is being negated:

• Sy weet nie ... nie = She does not know ...

The sentence does not mean that the bill has not been paid. It means that she doesn’t know whether it has already been paid.

That distinction matters.

So compare:

• Sy weet nie of die rekening reeds betaal is nie.
  = She doesn’t know whether the bill has already been paid.

versus

• Sy weet dat die rekening nie reeds betaal is nie.
  = She knows that the bill has not already been paid.

In the original sentence, the uncertainty is about the payment status.

Yes. A very natural everyday version would be:

• Sy weet nie of die rekening al betaal is nie.

This means the same thing, but al is often more conversational than reeds.

So you can think of:

• reeds = already, slightly more formal or written
• al = already, very common in speech

Both are good Afrikaans.