How to convert the following to the passive tense?
We have said enough of this problem.
Is 1 or 2 correct?
1. Enough has been said of this problem (by us).
2. This problem has been said enough of (by us).
#1 is possible, #2 is not.
In both active and passive, 'about' or 'on' would be far more natural than 'of', in my opinion.