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

English
Do know this
Czech
Známe tohohle kluka?
Does anybody know this boy?
What is this boy doing here?
Who is this boy?
Why is this boy here?
You are such a boring boy!
You are such a brave boy!
Do we know each other?
Do we know her address?
Do we know Miss Nováková?
He knows what we did last year.

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