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In a sentence
Plním si povinnosť.
I'm doing my duty.
Vždy plním svoje sľuby.
I always keep my promises.
Plní si povinnosť.
He does his duty.
Vždycky plnil svoje sľuby.
He always kept his promises.
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.