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

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

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