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In a sentence
Nikto o tom nikdy nepočul.
Nobody had ever heard of it.
Nič som od neho nepočul.
I have heard nothing from him.
Nikdy predtým som nepočul Toma sa sťažovať.
I've never heard Tom complain before.
Nikto o ňom nikdy nepočul.
Nobody's ever heard of him.
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.