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

English
How good is
Czech
Jak dobře umí norsky?
His Norwegian is getting better.
His Norwegian is very good.
How do you say that in Norwegian?
I do not speak Norwegian very well.
You speak Norwegian very well.
His native language is Norwegian.
Is he learning Norwegian on his own?
He is learning Norwegian.
He is Norwegian.
He is not Norwegian.

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