How to say in Czech: They don’t know if they have the time.

English
don’t know if have the time.
Czech
Oni nevědí, jestli mají čas.
They have known her for a long time.
I don’t know what they mean by that.
They don’t know.
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.

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