句子前半沒(méi)問(wèn)題,后半應(yīng)該加上個(gè)’發(fā)明‘.改善版本：
If Edison had not attempted to use metal in his experiment,the invention of the lightbulb would have been delayed for hundreds of years.主句應(yīng)用對(duì)過(guò)去的虛擬嗎？不應(yīng)該是would be delayed嗎這種情況從句的謂語(yǔ)得用過(guò)去完成時(shí)(had+過(guò)去分詞)，然后主句謂語(yǔ)用’should (would, could, might)+have+過(guò)去分詞‘： If I had called her，she would have been late. 要是我給她打了電話，她就遲到了。我覺(jué)得這個(gè)句子應(yīng)該是錯(cuò)綜時(shí)態(tài)的虛擬語(yǔ)氣，主句應(yīng)用would do