How to say in Czech: They speak Portuguese.

English
speak
Czech
Oni mluví portugalsky.
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 fluently.
They speak Portuguese very well.
Does anybody here speak Portuguese?
Are they learning Portuguese?
Are they learning Portuguese on their own?
They are learning Portuguese.

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