Alisha: 我在本课程中主要讲解了如何使用 "should have" 结构来表达英语中的后悔情绪。这个结构的基本形式是“主语 + should have + 过去分词”。 "Should have" 帮助我们谈论那些我们错过的机会或者让我们感到后悔的决定。非常重要的是,"should have" 后面必须紧跟动词的过去分词形式,因为过去分词表明这个动作已经发生或者应该发生在过去。例如,我说 "We should have called and made a reservation." 在这个句子中,"we" 是主语,而 "called" 和 "made" 都是过去分词。此外,我还提到 "should have" 可以缩写成 "should've",但这种缩写只适用于情态动词 "should have" 短语,在其他情况下不能使用。通过几个例句,例如 "We should have met up a bit later.","I should have taken my books back yesterday.","You should have made a reservation.","They should have turned off the air conditioner.","We should have ordered another pizza.",我详细解释了如何在实际对话中运用这个结构表达后悔。