How to say in Czech: He speaks Latvian fluently.

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

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