How to say in Czech: They speak only a little Chinese.

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

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