How to say in Czech: We don’t know if they have the time.

English
don’t know if have the time.
Czech
My nevíme, jestli mají čas.
They don’t know what we mean by that.
They have known her for a long time.
They know what we did last year.
They know what we did yesterday.
They don’t know.
They don’t know what to do anymore.
They just don’t know what to say.
We don’t know that.
We don’t know what it is.
We don’t know what to say.

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