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

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

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