How to say in Czech: Their Serbian is very good.

English
is very good.
Czech
Jejich srbština je velmi dobrá.
I do not speak Serbian very well.
You speak Serbian very well.
How good is their Serbian?
Their Serbian is getting better.
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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