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

English
do not speak
Czech
Oni nemluví srbsky.
They do not speak Serbian very well.
Do they speak Serbian?
They speak only a little Serbian.
They speak Serbian.
They speak Serbian fluently.
They speak Serbian very well.
Does anybody here speak Serbian?
Where did they learn Serbian?
They are not Serbian.
Are they learning Serbian?

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