How to say in Czech: They speak Swedish.

English
speak
Czech
Oni mluví švédsky.
Do they speak Swedish?
They do not speak Swedish.
They do not speak Swedish very well.
They speak only a little Swedish.
They speak Swedish fluently.
They speak Swedish very well.
Does anybody here speak Swedish?
Are they learning Swedish?
Are they learning Swedish on their own?
Are they Swedish?

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