How to say in Czech: He speaks Serbian fluently.

English
speaks fluently.
Czech
On mluví plynně srbsky.
He speaks only a little Serbian.
He speaks Serbian.
He speaks Serbian very well.
Does he speak Serbian?
He does not speak Serbian.
He does not speak Serbian very well.
Does anybody here speak Serbian?
He is learning Serbian.
He is not Serbian.
He is Serbian.

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