How to say in Czech: Are they learning Dutch?

English
Are learning
Czech
Učí se holandsky?
Are they learning Dutch on their own?
They are learning Dutch.
Where did they learn 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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