How to say in Czech: Are they learning Greek?

English
Are learning
Czech
Učí se řecky?
Are they learning Greek on their own?
They are learning Greek.
Where did they learn Greek?
Do they speak Greek?
They do not speak Greek.
They do not speak Greek very well.
They speak Greek.
They speak Greek fluently.
They speak Greek very well.
They speak only a little Greek.

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