How to say in Czech: They speak only a little Serbian.

English
speak only a little
Czech
Oni mluví jen trochu srbsky.
Do they speak Serbian?
They do not speak Serbian.
They do not speak Serbian very well.
They speak Serbian.
They speak Serbian fluently.
They speak Serbian very well.
Does anybody here speak Serbian?
Are they learning Serbian?
Are they learning Serbian on their own?
Are they Serbian?

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