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In a sentence
Nikto ťa nemôže nahradiť.
No one can replace you.
Nahradili starý mixer novým.
They replaced the old mixer with a new one.
Starú žiarovku nahradili úspornejšou.
They replaced the old bulb with a more efficient one.
Kolega ma nahradí počas dovolenky.
A colleague will replace me during vacation.
Examples from Tatoeba (CC BY 2.0 FR).
Source
Slovak National Corpus (SNK) ↗English gloss from the frequency publish path. Includes Tatoeba example sentences when present.
Full attribution on References.