How to say in Czech: Do they speak Swedish?

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

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