Translation:My teacher knows that I do not work hard.
"Keep in mind that in dependent clauses, the negation ikke gets pulled to a position in-between the subject and the main verb. This occurs with several other constructions as well. This is one weird quirk with Norwegian grammar, but it will sound natural after a while.
Norwegian ----- English Hun er ikke her. ----- She is not here. Jeg vet at hun ikke er her. ----- I know that she is not here."