How to say in Czech: He speaks only a little Japanese.

English
speaks only a little
Czech
On mluví jen trochu japonsky.
He speaks Japanese.
He speaks Japanese fluently.
He speaks Japanese very well.
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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