How to say in Czech: Are they learning Chinese on their own?

English
Are learning on their own?
Czech
Oni se učí čínsky jako samouk?
Are they learning Chinese?
They are learning Chinese.
Where did they learn Chinese?
How good is their Chinese?
Their Chinese is getting better.
Their Chinese is very good.
Their native language is Chinese.
Are they Chinese?
They are Chinese.
They are not Chinese.

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