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

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

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