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

English
is such a
Czech
On je tak tichý kluk!
He is quiet.
He is trying to be quiet.
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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