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

English
How good is
Czech
Jak dobře umějí estonsky?
Their Estonian is getting better.
Their Estonian is very good.
How do you say that in Estonian?
I do not speak Estonian very well.
You speak Estonian very well.
Their native language is Estonian.
Are they learning Estonian on their own?
Estonian is a difficult language.
Estonian is difficult.
He is learning Estonian.

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