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

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