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

English
Where did learn
Czech
Kde ses naučil portugalsky?
Are you learning Portuguese?
Are you learning Portuguese on your own?
I am learning Portuguese.
Do you speak Portuguese?
How do you say that in Portuguese?
You do not speak Portuguese very well.
I do not speak Portuguese.
Does anybody here speak Portuguese?
You speak Portuguese very well.
How good is your Portuguese?

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