How to say in Czech: Where did they learn Serbian?

English
Where did learn
Czech
Kde se naučili srbsky?
Are they learning Serbian?
Are they learning Serbian on their own?
They are learning Serbian.
Do they speak Serbian?
They do not speak Serbian.
They do not speak Serbian very well.
Are they Serbian?
They are not Serbian.
They are Serbian.
They speak only a little Serbian.

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