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

English
is such a
Czech
On je tak přátelský kluk!
He is friendly.
He is trying to be friendly.
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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