How to say in Czech: His native language is Romanian.

English
native language is
Czech
Jeho rodný jazyk je rumunština.
Romanian is a difficult language.
His Romanian is getting better.
His Romanian is very good.
How good is his Romanian?
Is he learning Romanian on his own?
He is learning Romanian.
Is he learning Romanian?
Romanian is difficult.
Do you speak Romanian?
I do not speak Romanian.

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