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

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

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