How to say in Czech: He is such a polite boy!

English
is such a
Czech
On je tak zdvořilý kluk!
He is polite.
He is trying to be polite.
That was not very polite of you.
He is such a boring 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.

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