Is is the present-tense form of to be in Afrikaans, just like English is in The quality is good.
In this sentence, it links the subject die kwaliteit to the description goed.
One very helpful feature of Afrikaans is that verbs usually do not change much for different persons in the present tense. For example:
So is is used very widely.
Because goed comes after the verb is, where it is used predicatively.
In Afrikaans, adjectives often have:
So:
This is a very common pattern in Afrikaans.
A rough guide is:
duh kwa-li-TEIT is khoot
A few pronunciation notes:
So an even more learner-friendly pronunciation guide would be:
dee kva-li-TEIT is khoot
Yes. In a yes/no question, Afrikaans usually puts the verb first:
This verb-first pattern is very important in Afrikaans questions.