How to say in Czech: How good is his Chinese?

English
How good is
Czech
Jak dobře umí čínsky?
His Chinese is getting better.
His Chinese is very good.
How do you say that in Chinese?
I do not speak Chinese very well.
You speak Chinese very well.
His native language is Chinese.
Is he learning Chinese on his own?
Chinese is a difficult language.
Chinese is difficult.
He is Chinese.

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