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

English
is getting better.
Czech
Jejich švédština se zlepšuje.
I do not speak Swedish very well.
You speak Swedish very well.
How good is their Swedish?
Their Swedish is very good.
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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