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

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

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