How to say in Czech: Do they speak Latvian?

English
Do speak
Czech
Mluví lotyšsky?
They do not speak Latvian.
They do not speak Latvian very well.
They speak Latvian.
They speak Latvian fluently.
They speak Latvian very well.
They speak only a little Latvian.
Does anybody here speak Latvian?
Where did they learn Latvian?
Are they learning Latvian?
Are they learning Latvian on their own?

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