Questions & Answers about Jeg har tretti bøker.
- Jeg = I
- har = have (present tense of å ha = to have)
- tretti = thirty
- bøker = books (indefinite plural of bok = book)
So the sentence is literally I have thirty books.
Norwegian verbs do not change with the subject in the present tense.
So:
- jeg har = I have
- du har = you have
- han/hun har = he/she has
- vi har = we have
- dere har = you (plural) have
- de har = they have
It is always har, no matter who is doing the action. There is no separate form like English has.