An English teacher handed this text to his/her students with the following sentence highlighted. Analyze his criteria to do so:

If I would have told my 18 year-old self that someday I'd work with (and become great friends with) Matthew Lillard, enjoy meals and social deduction games with Kevin Williamson, and have a relaxed, casual dinner with Neve Campbell… I frankly would never have believed it.

Which item presents the standard form of the sentence structure in question ?