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

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

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