How to say in Czech: Their Estonian is very good.

English
is very good.
Czech
Jejich estonština je velmi dobrá.
I do not speak Estonian very well.
You speak Estonian very well.
How good is their Estonian?
Their Estonian is getting better.
Their native language is Estonian.
Are they learning Estonian on their own?
Estonian is a difficult language.
Estonian is difficult.
He is learning Estonian.
Is he learning Estonian?

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