How to say in Czech: They are learning Portuguese.

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

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