How to say in Czech: Their Norwegian is getting better.

English
is getting better.
Czech
Jejich norština se zlepšuje.
I do not speak Norwegian very well.
You speak Norwegian very well.
How good is their Norwegian?
Their Norwegian is very good.
Their native language is Norwegian.
Are they learning Norwegian on their own?
He is learning Norwegian.
He is Norwegian.
He is not Norwegian.
Is he learning Norwegian?

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