How to say in Czech: They speak Estonian fluently.

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

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