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

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

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