How to say in Czech: His native language is Estonian.

English
native language is
Czech
Jeho rodný jazyk je estonština.
Estonian is a difficult language.
His Estonian is getting better.
His Estonian is very good.
How good is his Estonian?
Is he learning Estonian on his own?
Estonian is difficult.
He is learning Estonian.
Is he learning Estonian?
Do you speak Estonian?
I do not speak Estonian.

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