Questions & Answers about Hún krefur hann um svar.
Krefur is the 3rd person singular present form of the verb krefja.
A very useful pattern is:
krefja einhvern um eitthvað
= to demand something from someone
So in your sentence:
- Hún = she
- krefur = demands
- hann = him
- um svar = for an answer / a reply
This is a verb you usually learn together with its case pattern, because that pattern is important in Icelandic.
Because krefja takes a direct object in the accusative case.
So:
- hann = accusative form of hann/he
- honum = dative form, which would be wrong here
In other words, the verb krefja specifically wants:
- a person in the accusative
- plus um
- the thing being demanded
So Hún krefur hann um svar is correct, but Hún krefur honum um svar is not.