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

English
Do know this
Czech
Znáš tohohle pána?
Does anybody know this gentleman?
What is this gentleman doing here?
Who is this gentleman?
Why is this gentleman here?
You are young.
You didn’t write that.
Do you know Miss Nováková?
Do you know my address?
I don’t know what you mean by that.
I know what you did last year.

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