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In a sentence
Tom sa musí sústrediť.
Tom must concentrate.
Tom sa nemohol sústrediť.
Tom couldn't concentrate.
Pred skúškou som sa sústredil na najťažšie témy.
Before the exam I focused on the hardest topics.
Sústredila pozornosť na detaily v zmluve.
She concentrated her attention on the details in the contract.
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.