How to say in Czech: They don’t know.

English
don’t know.
Czech
Oni nevědí.
I don’t know if they have the time.
I don’t know what they mean by that.
They don’t know what to do anymore.
They just don’t know what to say.
Do they know each other?
Do they know her address?
Do they know Miss Nováková?
Do they know this boy?
He knows what they did last year.
He knows what they did yesterday.

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