How to say in Czech: How good is their Hungarian?

English
How good is
Czech
Jak dobře umějí maďarsky?
Their Hungarian is getting better.
Their Hungarian is very good.
How do you say that in Hungarian?
I do not speak Hungarian very well.
You speak Hungarian very well.
Their native language is Hungarian.
Are they learning Hungarian on their own?
He is Hungarian.
He is learning Hungarian.
He is not Hungarian.

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