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

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

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