How to say in Czech: Their native language is German.

English
native language is
Czech
Jejich rodný jazyk je němčina.
What is their native language?
German is a difficult language.
How good is their German?
Their German is getting better.
Their German is very good.
Are they learning German on their own?
German is difficult.
He is German.
He is learning German.
He is not German.

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