should have本应做却没做 表虚拟吧 后面or的 抱歉 would have 也表示虚拟语气吗？
句子 i would nothave broken my arm if i had not fallen off the ladder.中的would not 跟had not的位置是否需要调换一下？would have 也表示虚拟的 表将来虚拟 would not用于主句 had not 从句 if后接从句 所以需要替换的