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

English
is getting better.
Czech
Jejich němčina se zlepšuje.
I do not speak German very well.
You speak German very well.
How good is their German?
Their German is very good.
Their native language is German.
Are they learning German on their own?
German is a difficult language.
German is difficult.
He is German.
He is learning German.

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