How to say in Czech: Is he learning Estonian on his own?

English
Is learning on his own?
Czech
On se učí estonsky jako samouk?
He is learning Estonian.
Is he learning Estonian?
Where did he learn Estonian?
His Estonian is getting better.
His Estonian is very good.
His native language is Estonian.
How good is his Estonian?
Does he speak Estonian?
He does not speak Estonian.
He does not speak Estonian very well.

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