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

English
Are learning on their own?
Czech
Oni se učí francouzsky jako samouk?
Are they learning French?
They are learning French.
Where did they learn French?
How good is their French?
Their French is getting better.
Their French is very good.
Their native language is French.
Are they French?
They are French.
They are not French.

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