How to say in Czech: Do they know each other?

English
Do know each other?
Czech
Znají se?
When was the last time they saw each other?
When will they see each other again?
To each his own.
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.
I don’t know if they have the time.
I don’t know what they mean by that.

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