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

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

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