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Usage
How to use it
Písať is writing as you go. Napísať finishes the text.
Examples
In a sentence
písať — ongoing / imperfective
Píšem list.
I'm writing a letter.
napísať — write to completion (see napísať)
Napíšem list.
I'll write a letter.
Source
Slovak National Corpus (SNK) ↗English gloss from the frequency publish path. Hand-reviewed example sentences.
Full attribution on References.