How to say in Czech: They do not speak Latvian.

English
do not speak
Czech
Oni nemluví lotyšsky.
They do not speak Latvian very well.
Do they speak Latvian?
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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