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

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

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