How to say in Czech: They speak only a little Japanese.

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

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