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

English
is very good.
Czech
Jejich čínština je velmi dobrá.
I do not speak Chinese very well.
You speak Chinese very well.
How good is their Chinese?
Their Chinese is getting better.
Their native language is Chinese.
Are they learning Chinese on their own?
Chinese is a difficult language.
Chinese is difficult.
He is Chinese.
He is learning Chinese.

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