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

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

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