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In a sentence
Nevedno, kedy príde autobus.
It is unknown when the bus will arrive.
Nevedno, kto nechal otvorené okno.
One does not know who left the window open.
Nevedno, prečo sa neozval.
It is unknown why he did not get in touch.
Nevedno, kam sa stratili kľúče.
One does not know where the keys disappeared.
Source
Slovak National Corpus (SNK) ↗English gloss from the frequency publish path. Hand-reviewed example sentences.
Full attribution on References.