How to say in Czech: Do we know this gentleman?

English
Do know this
Czech
Známe tohohle pána?
Does anybody know this gentleman?
What is this gentleman doing here?
Who is this gentleman?
Why is this gentleman here?
Do we know each other?
Do we know her address?
Do we know Miss Nováková?
He knows what we did last year.
He knows what we did yesterday.
They don’t know what we mean by that.

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