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

English
How good is
Czech
Jak dobře umějí arabsky?
Their Arabic is getting better.
Their Arabic is very good.
How do you say that in Arabic?
I do not speak Arabic very well.
You speak Arabic very well.
Their native language is Arabic.
Are they learning Arabic on their own?
Arabic is a difficult language.
Arabic is difficult.
He is learning Arabic.

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