Eers nadat refreine gerepeteer is, begin solo's en duette.

Nadat means after.

Adding eers gives extra emphasis: only after or not until after. So eers nadat tells you that the second action does not happen before the first one is finished.

Compare:

• Nadat refreine gerepeteer is, begin solo's en duette.
  = After the choruses have been rehearsed, solos and duets begin.

• Eers nadat refreine gerepeteer is, begin solo's en duette.
  = Only after the choruses have been rehearsed do solos and duets begin.

So eers is adding the idea of limitation or sequence.

Because nadat introduces a subordinate clause, and Afrikaans pushes the finite verb to the end of that clause.

In a main clause, you would normally get:

• Die refreine is gerepeteer.

But after nadat, the order changes to:

• nadat refreine gerepeteer is

This is very common in Afrikaans. Compare:

• Hy het gekom.
• omdat hy gekom het

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

Afrikaans main clauses usually follow a verb-second pattern.

The whole opening part Eers nadat refreine gerepeteer is takes the first position in the sentence. Once that first position is filled, the finite verb of the main clause must come next:

• Eers nadat refreine gerepeteer is, begin solo's en duette.

So the subject comes after the verb here.

A more neutral order without fronting would be:

• Solo's en duette begin eers nadat refreine gerepeteer is.

Both are correct, but the given sentence puts emphasis on the timing.

Yes. Gerepeteer is the past participle of repeteer.

Afrikaans often forms the past participle with ge-:

• repeteer → gerepeteer
• oefen → geoefen
• sing → gesing

In this sentence, gerepeteer is used together with is in a passive structure:

• refreine gerepeteer is
  = choruses have been rehearsed / are rehearsed, depending on context

So gerepeteer is the non-finite verb form, and is is the finite auxiliary.

Because the sentence is talking about these things in a general sense, not pointing to specific identified ones.

Afrikaans often leaves out the article with plural nouns when speaking generally:

• Refreine
• solo's en duette

If you wanted to refer to specific ones, you could say:

• die refreine
• die solo's en duette

So the lack of die does not mean anything is missing; it just makes the statement more general.

Some Afrikaans nouns, especially loanwords ending in a vowel, form the plural with apostrophe + s.

So:

• solo → solo's
• foto → foto's
• radio → radio's

But not all nouns do this. In the same sentence:

• duet → duette
• refrein → refreine

So the apostrophe in solo's is simply part of the normal plural spelling for that kind of word.

Yes, begin is present tense.

That works because the sentence is expressing a sequence or general rule rather than telling a one-time past story. It means something like:

• once the choruses have been rehearsed, the solos and duets begin

Afrikaans often uses the present tense this way for schedules, instructions, stage directions, or general descriptions of what happens next.

So there is no contradiction: the first action is completed before the second one starts, but the whole sentence can still be framed in the present.

Nadat is a conjunction meaning after. It introduces a clause that gives the earlier event.

Here:

• nadat refreine gerepeteer is
  = after choruses have been rehearsed

That clause sets the timing for the main clause:

• begin solo's en duette

So nadat is the word that links the two events and shows their order. It also triggers subordinate-clause word order, which is why the verb ends up at the end.