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

English
is getting better.
Czech
Jejich dánština se zlepšuje.
I do not speak Danish very well.
You speak Danish very well.
How good is their Danish?
Their Danish is very good.
Their native language is Danish.
Are they learning Danish on their own?
Danish is a difficult language.
Danish is difficult.
He is Danish.
He is learning Danish.

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