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

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

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