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

English
is getting better.
Czech
Jejich ukrajinština se zlepšuje.
I do not speak Ukrainian very well.
You speak Ukrainian very well.
How good is their Ukrainian?
Their Ukrainian is very good.
Their native language is Ukrainian.
Are they learning Ukrainian on their own?
He is learning Ukrainian.
He is not Ukrainian.
He is Ukrainian.
Is he learning Ukrainian?

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