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

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

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