How to say in Czech: They speak Latvian fluently.

English
speak fluently.
Czech
Oni mluví plynně lotyšsky.
Do they speak Latvian?
They do not speak Latvian.
They do not speak Latvian very well.
They speak Latvian.
They speak Latvian very well.
They speak only a little Latvian.
Does anybody here speak Latvian?
Are they learning Latvian?
Are they learning Latvian on their own?
They are learning Latvian.

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