How to say in Czech: How good is his Estonian?

English
How good is
Czech
Jak dobře umí estonsky?
His Estonian is getting better.
His Estonian is very good.
How do you say that in Estonian?
I do not speak Estonian very well.
You speak Estonian very well.
His native language is Estonian.
Is he learning Estonian on his own?
Estonian is a difficult language.
Estonian is difficult.
He is learning Estonian.

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