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

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

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