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

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

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