How to say in Czech: Where did they learn Portuguese?

English
Where did learn
Czech
Kde se naučili portugalsky?
Are they learning Portuguese?
Are they learning Portuguese on their own?
They are learning 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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