How to say in Czech: Are they learning Dutch on their own?

English
Are learning on their own?
Czech
Oni se učí holandsky jako samouk?
Are they learning Dutch?
They are learning Dutch.
Where did they learn Dutch?
How good is their Dutch?
Their Dutch is getting better.
Their Dutch is very good.
Their native language is Dutch.
Do they speak Dutch?
They do not speak Dutch.
They do not speak Dutch very well.

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