I came across this long sentence in a novel, and would like to analyze it grammatically:
"I spent [...] time racking my brains for gems of Philosophy [....] , but I have come up with nothing that you could not (and probably already) have found in Plato, Socrates and the pages of Punch Magazine"
I know what the speaker is trying to say.
Now, the whole sentence above (given as a reference for folks who would rightly want the whole context) is not necessary for my question here, so I left out some words and highlighted a sub-sentence, for simplicity. The relevant part is:
"I have come up with nothing that you could not (and probably already) have found in Plato"
With the double negative, what is the parallelism structure ?
I think there is something wrong here with the tenses because, it requires "could not have found" and "would not already have found". The original sentence does not have "would", and the parallelism seems improper.