How to say in Czech: How good is his German?

English
How good is
Czech
Jak dobře umí německy?
His German is getting better.
His German is very good.
How do you say that in German?
I do not speak German very well.
You speak German very well.
His native language is German.
Is he learning German on his own?
German is a difficult language.
German is difficult.
He is German.

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