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

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

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