How to say in Czech: His Japanese is very good.

English
is very good.
Czech
Jeho japonština je velmi dobrá.
I do not speak Japanese very well.
You speak Japanese very well.
His Japanese is getting better.
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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