How to say in Czech: My Serbian is getting better.

English
is getting better.
Czech
Moje srbština se zlepšuje.
I do not speak Serbian very well.
You speak Serbian very well.
My Serbian is very good.
How good is your Serbian?
My native language is Serbian.
He is learning Serbian.
He is not Serbian.
He is Serbian.
Is he learning Serbian?
Is he learning Serbian on his own?

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