How to say in Czech: We don’t know if he has the time.

English
don’t know if has the time.
Czech
My nevíme, jestli má čas.
He has known her for a long time.
We don’t know what he means by that.
He knows what we did last year.
He knows what we did yesterday.
We don’t know.
We don’t know that.
We don’t know what it is.
We don’t know what to do anymore.
We don’t know what to say.
We just don’t know what to say.

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