How to say in Czech: Their Swedish is very good.

English
is very good.
Czech
Jejich švédština je velmi dobrá.
I do not speak Swedish very well.
You speak Swedish very well.
How good is their Swedish?
Their Swedish is getting better.
Their native language is Swedish.
Are they learning Swedish on their own?
He is learning Swedish.
He is not Swedish.
He is Swedish.
Is he learning Swedish?

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