How to say in Czech: He speaks Japanese fluently.

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

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