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

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

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