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

English
Do know each other?
Czech
Znáte se?
When was the last time you saw each other?
When will you see each other again?
You are young.
To each his own.
You didn’t write that.
Do you know Miss Nováková?
Do you know my address?
Do you know this boy?
I don’t know what you mean by that.
I know what you did last year.

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