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

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

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