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

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

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