How to say in Czech: They are learning Estonian.

English
are learning
Czech
Oni se učí estonsky.
Are they learning Estonian?
Are they learning Estonian on their own?
Where did they learn Estonian?
Do they speak Estonian?
They do not speak Estonian.
They do not speak Estonian very well.
They speak Estonian.
They speak Estonian fluently.
They speak Estonian very well.
They speak only a little Estonian.

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