How to say in Czech: They speak Portuguese fluently.

English
speak fluently.
Czech
Oni mluví plynně 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.
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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