Ek weet nie watter beker ek vir jou moet gee nie, want al twee lyk dieselfde.

I do not know which cup I must give you, because both look the same.

Breakdown of Ek weet nie watter beker ek vir jou moet gee nie, want al twee lyk dieselfde.

• ek: I
• nie: not
• vir: for
• moet: must

Questions & Answers about Ek weet nie watter beker ek vir jou moet gee nie, want al twee lyk dieselfde.

Why are there two nies in Ek weet nie ... nie?

Afrikaans normally uses double negation.

• The first nie usually comes after the finite verb or after the part being negated.
• The second nie usually comes near the end of the clause.

So:

• Ek weet nie = I do not know
• Ek weet nie ... nie = the full Afrikaans negative pattern

In this sentence:

• Ek weet nie watter beker ek vir jou moet gee nie
  literally follows the Afrikaans pattern: I know not which cup I for you must give not.

This is completely normal Afrikaans grammar, not extra emphasis.

Why is the word order watter beker ek vir jou moet gee and not watter beker ek moet vir jou gee?