How to say in Czech: Their Slovenian is getting better.

English
is getting better.
Czech
Jejich slovinština se zlepšuje.
I do not speak Slovenian very well.
You speak Slovenian very well.
How good is their Slovenian?
Their Slovenian is very good.
Their native language is Slovenian.
Are they learning Slovenian on their own?
He is learning Slovenian.
Is he learning Slovenian?
Slovenian is a difficult language.
Slovenian is difficult.

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