How to say in Czech: How good is his Ukrainian?

English
How good is
Czech
Jak dobře umí ukrajinsky?
His Ukrainian is getting better.
His Ukrainian is very good.
How do you say that in Ukrainian?
I do not speak Ukrainian very well.
You speak Ukrainian very well.
His native language is Ukrainian.
Is he learning Ukrainian on his own?
He is learning Ukrainian.
He is not Ukrainian.
He is Ukrainian.

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