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

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

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