Use of past perfect or present tense?
Here's the sentence--I want to convey that confidential information is no longer being conveyed, but the presumption is relevant to date (I want to maintain this linguistic style absent an incontrovertible grammatical error): "Thus, confidential information is presumed to had been conveyed to the group." I do not believe "have been" would be appropriate because the conveyance does not continue to occur, and, what is more, the conveyance occurred long ago--about a decade ago. In this context, I believe "had been" is appropriate. (Again, I don't want to change the structure of the sentence, and, with that constraint, is it grammatical?)
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