How to say in Czech: He is such an impolite boy!

English
is such an
Czech
On je tak nezdvořilý kluk!
He is trying not to be impolite.
That was very impolite of you.
He is such a brave boy!
Does he know this boy?
What is this boy doing here?
Who is this boy?
Why is this boy here?
Does anybody know this boy?
He is young.
He lives there.

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