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

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

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