How to say in Czech: How good is her Arabic?

English
How good is
Czech
Jak dobře umí arabsky?
Her Arabic is getting better.
Her Arabic is very good.
Her native language is Arabic.
Is she learning Arabic on her own?
How do you say that in Arabic?
I do not speak Arabic very well.
You speak Arabic very well.
Arabic is a difficult language.
Arabic is difficult.
He is learning Arabic.

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