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

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

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