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

English
native language is
Czech
Jejich rodný jazyk je litevština.
Lithuanian is a difficult language.
How good is their Lithuanian?
Their Lithuanian is getting better.
Their Lithuanian is very good.
Are they learning Lithuanian on their own?
He is learning Lithuanian.
Is he learning Lithuanian?
Lithuanian is difficult.
Do you speak Lithuanian?
I do not speak Lithuanian.

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