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

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

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