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

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

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