How to say in Czech: Their native language is Slovenian.

English
native language is
Czech
Jejich rodný jazyk je slovinština.
Slovenian is a difficult language.
How good is their Slovenian?
Their Slovenian is getting better.
Their Slovenian is very good.
Are they learning Slovenian on their own?
He is learning Slovenian.
Is he learning Slovenian?
Slovenian is difficult.
Do you speak Slovenian?
I do not speak Slovenian.

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