0 used to ask for specific information -- hvilken
1 emphasizes a description -- for
2 used to ask for specific information -- hva
3 the thing that is being talked about -- hva som
She told me what had happened. Hun fortalte meg hva som hadde hendt.
4 used to ask about the purpose of sth -- hva … til/for?
What did you do that for? Hva gjorde du det for?
What’s this money for? Hva er disse pengene til?
5 used to ask why -- hvorfor?
“I told them to leave.” “What for?” “Jeg bad dem om å gå.” “Hvorfor?”