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

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

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