How to say in Czech: His native language is Chinese.

English
native language is
Czech
Jeho rodný jazyk je čínština.
What is his native language?
Chinese is a difficult language.
His Chinese is getting better.
His Chinese is very good.
How good is his Chinese?
Is he learning Chinese on his own?
Chinese is difficult.
He is Chinese.
He is learning Chinese.
He is not Chinese.

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