How to say in Czech: He speaks Portuguese fluently.

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

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