You've all been so very helpful, I've got another question for you. I know using "forgotten" will give me away as an American in a minute, and I've been told that pretty much the only exception to using "gotten" over "got" would be in the phrase "ill-gotten gains." In that phase "ill-gotten" is being used to describe the gains; that would make it an adjective, right? (Please humor me. It has been a **very** long time since I diagrammed a sentence.) Would you also say "forgotten past" or "forgotten memories?" Not being the way I would normally speak, saying something like "He's got away with it." sounds strange to me--strange, but not wrong, just different. I would say, "He's gotten away with it." On the other hand, someone talking about a "forgot past" or "forgot memories" sounds wrong enough that I wanted to check. Since "forgot/forgotten" is being use to describe the memories and/or the past, which would you use? Thanks so much for your help!
(Diagramming a sentence is just drawing diagonal lines under different words in the sentence and identifying them as nouns, verbs, adjective, adverbs, etc,)