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If I had V-ed, I would have ... 结构︰Ifhad+过去分词，主词+would/should 等+have+过去分词 说明︰这是与过去事实相反的假设句型。if 子句要用过去完成式主要子句则要用过去式助动词+have+过去分词。if 子句中的 had可置于主词前面，而省略 If。 If I had seen him, I would have told him the truth. 如果我当时看见他，我会告诉他实情。 I could have finished the task if I had had more time. 如果当时我能有多一点时间，我就能完成这项任务。 If we had known of your departure, we would have seen you off at the airport. 如果我们事先知道你要离开，我们会到机场送行。 I someone had been with him, he might not have been drowned. 如果有人在他旁边，或许他就不会溺死。 I might have been incredulous had I not been accustomed to such responses. 若非我已经习惯了这样的回答，我可能不敢轻易相信。 Had he not apologize to her, she would not have forgiven him. 她不会原谅他，若非他道了歉。 Had he not saved me, I might have been drowned. 我可能溺死了，若非他救了我。 | 
