You would start by figuring what the passive transformation does, thus what sentence your sentence "starts from" (doesn't undergo passive). You would also want to likewise undo the question transformation. Then it is a simple matter of figuring out what the deep structure of the sentence without either the passive or question transformations having applied, and then deal with the "other stuff" like affix-hopping. If you have no idea what affix hopping is, then you would have to know what theory of syntax your instructor is using. I'm betting that it doesn't actually involve affix hopping.
