How to say in Czech: They speak German fluently.

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

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