This is the 17th most frequent Danish word.
blev
"Blev" means "became" or "was" (past tense of "to become" or auxiliary verb in passive constructions).
'Blev' is used in a passive voice construction to indicate the action of building was done to the house.
Huset blev bygget sidste år.
The house was built last year.
'Blev' is part of a question about whether an action is completed.
Blev du færdig med lektierne?
Did you finish the homework?
'Blev' indicates a change of state, from not being happy to becoming happy.