How to say in Czech: They speak Estonian.

English
speak
Czech
Oni mluví estonsky.
Do they speak Estonian?
They do not speak Estonian.
They do not speak Estonian very well.
They speak Estonian fluently.
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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