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

English
is such a
Czech
On je tak statečný kluk!
He is brave.
He is trying to be brave.
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.
He lives there.

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