izvesno

1. (izvesno je) it is certain; certain
   Izvesno je da će cene opet porasti. — It's certain that prices will go up again.
   Još nije izvesno ko će biti novi direktor. — It's not yet certain who the new director will be.
2. formal certainly; surely
   Vlada će izvesno promeniti zakon. — The government will certainly change the law.

Most often in izvesno je da…; do not confuse with izvestan 'some, a certain' (izvesno vreme — for some time). False friend for Russian speakers: izvesno means 'certain', not «известно» ('known'), which is poznato.