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In a sentence
Netuším, kto je Tom.
I have no idea who Tom is.
Netuším, kto je jej strýko.
I have no idea who her uncle is.
Netuším, prečo dal zrazu výpoveď.
I have no idea why he quit his job suddenly.
Netuším, ako to urobiť.
I have no idea how to do this.
Examples from Tatoeba (CC BY 2.0 FR).
Source
Slovak National Corpus (SNK) ↗English gloss from the frequency publish path. Example sentences from Tatoeba (CC BY 2.0 FR).
Full attribution on References.