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

English
native language is
Czech
Jejich rodný jazyk je čínština.
What is their native language?
Chinese is a difficult language.
How good is their Chinese?
Their Chinese is getting better.
Their Chinese is very good.
Are they learning Chinese on their own?
Chinese is difficult.
He is Chinese.
He is learning Chinese.
He is not Chinese.

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