the difference between "si" and "sier" is that "sier" is continuous?
"sier" is the present tense, while "(å) si" is the infinitive.
There is no dedicated present continuous tense in Norwegian, only a single present tense which covers both the English simple present and the English present continuous.
got it! Takk!
Hva ser han sounds the same
"What says he?" " What say you?" are correct!!
"What says he?" is indeed correct (although a bit old-fashioned), but "What say you?" is not. That would be "Hva sier du?".