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In a sentence
Tom nemohol odpovedať na tú otázku.
Tom couldn't answer that question.
Je ťažké odpovedať na túto otázku.
This question is difficult to answer.
Nemusíš odpovedať, ak nechceš.
You don't have to answer if you don't want to.
Ak nechceš odpovedať, nemusíš.
If you don't want to answer, you don't have to.
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.