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

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

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