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

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

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