How to say in Czech: Are they learning Portuguese?

English
Are learning
Czech
Učí se portugalsky?
Are they learning Portuguese on their own?
They are learning Portuguese.
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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