How to say in Czech: They speak Chinese fluently.

English
speak fluently.
Czech
Oni mluví plynně čínsky.
Do they speak Chinese?
They do not speak Chinese.
They do not speak Chinese very well.
They speak Chinese.
They speak Chinese very well.
They speak only a little Chinese.
Does anybody here speak Chinese?
Are they Chinese?
Are they learning Chinese?
Are they learning Chinese on their own?

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