在這裡用 would've/would have expected 或 expected/have expected 都不會改變句子的意思。差別在於，would have 表示假設的情況，而 have expected/expected 則表示的確有發生過的情況。因此，可以將魯霸·海格說的 you're a bit more along than I would've expected 理解為假設的語氣，也就是指「假設他有預期過的話，達力可比他預期中的哈利更胖」。
例句: You're younger than I would have expected (if I had any expectations). (Hypothetical expectations, had they been made) (你比我預期的要年輕。※假設有做過預期)
例句: You're younger than I expected. (Actual speculation made in the past) (你比我預期的要年輕。※的確有做過預期)
以上聽起來似乎很複雜，但只要記住：的確有做過預期的話，就用過去式 expected；沒有做過預期的話，就用 would have expected。