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In a sentence
Tom sa snažil Máriu upozorniť.
Tom tried to warn Mary.
Tom nás upozornil, že sa to môže stať.
Tom warned us that this might happen.
Upozornil nás na nebezpečnú zákrutu.
He warned us about a dangerous bend.
Chcem ťa upozorniť na zmenu času.
I want to point out the time change to you.
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.