How to say in Czech: Is he learning Danish on his own?

English
Is learning on his own?
Czech
On se učí dánsky jako samouk?
He is learning Danish.
Is he learning Danish?
Where did he learn Danish?
His Danish is getting better.
His Danish is very good.
His native language is Danish.
How good is his Danish?
He is Danish.
He is not Danish.
Is he Danish?

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