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

English
is very good.
Czech
Jejich japonština je velmi dobrá.
I do not speak Japanese very well.
You speak Japanese very well.
How good is their Japanese?
Their Japanese is getting better.
Their native language is Japanese.
Are they learning Japanese on their own?
He is Japanese.
He is learning Japanese.
He is not Japanese.
Is he Japanese?

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