How to say in Czech: They are learning Greek.

English
are learning
Czech
Oni se učí řecky.
Are they learning Greek?
Are they learning Greek on their own?
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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