How to say in Czech: He speaks Romanian fluently.

English
speaks fluently.
Czech
On mluví plynně rumunsky.
He speaks only a little Romanian.
He speaks Romanian.
He speaks Romanian very well.
Does he speak Romanian?
He does not speak Romanian.
He does not speak Romanian very well.
Does anybody here speak Romanian?
He is learning Romanian.
Is he learning Romanian?
Is he learning Romanian on his own?

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