How to say in Czech: His Chinese is very good.

English
is very good.
Czech
Jeho čínština je velmi dobrá.
I do not speak Chinese very well.
You speak Chinese very well.
His Chinese is getting better.
How good is his Chinese?
His native language is Chinese.
Is he learning Chinese on his own?
Chinese is a difficult language.
Chinese is difficult.
He is Chinese.
He is learning Chinese.

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