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

English
Do know this
Czech
Znají 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 they know each other?
Do they know her address?
Do they know Miss Nováková?
He knows what they did last year.

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