How to say in Czech: Do they speak Portuguese?

English
Do speak
Czech
Mluví portugalsky?
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.
Does anybody here speak Portuguese?
Where did they learn Portuguese?
Are they learning Portuguese?
Are they learning Portuguese on their own?

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