Learning such a thing would have proved instructive for the men from the south, had they attempted it.
"Meeting your friend has proved instructive," he said to Kurgan before walking out of the tavern.
But it's really the scene before Nora slams the door that proves instructive.
Once again, the analogy with the commandment against killing (or murder) proves instructive.
Her parting words to Mary had proved most instructive to the young maidservant.
But for those who make the effort, the presentation will prove both accessible and instructive.
I believe, however, that it has proved most instructive.
It was a debate that could have proved instructive.
What had happened on the holodeck was not a secret and, in fact, might prove instructive to others.
It might prove instructive for you to do so.