How to say in Czech: Their Arabic is very good.

English
is very good.
Czech
Jejich arabština je velmi dobrá.
I do not speak Arabic very well.
You speak Arabic very well.
How good is their Arabic?
Their Arabic is getting better.
Their native language is Arabic.
Are they learning Arabic on their own?
Arabic is a difficult language.
Arabic is difficult.
He is learning Arabic.
Is he learning Arabic?

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