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

English
is such a
Czech
On je tak nudný kluk!
He is trying not to be boring.
Am I really that boring?
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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