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    If I had V-ed，I would have ……

    结构︰If…had＋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。if要用，则要用过去式（would，should，ought to，might，could）＋have＋过去。if中的had可置于前面，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（那时）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。

    Had I proposed to you,would you have married me?

    我要是当年向你求婚，你会答应嫁给我吗？

    Had you not helped us,we should have canceled this transaction.

    假如没有你的帮助，这笔生意早就告吹了。