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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。

If I had V-ed, I would ...

结构︰If…had+过去分词…，主词+would/should 等+原形动词+now/today

说明︰这是不一致时的假设，亦称混合假设条件句。即：if 若与过去事实相反，用表示;而若与现在事实相反，则用过去式表示。此类句尾通常有表现在的，如 now，today 等。

If he had worked harder when young, he would be well off now.

如果他年轻时多努力一点，现在就能过得舒服些。

If I had been rich ten years ago, I could buy that house today.

如果十年前我有钱，今天我就能买下那栋房子了。

Had he told the truth, he wouldn’t be punished now.如果他当时肯说实话，现在就不会受罪了。

Had he followed the doctor’s advice, he might be alive now.

当时他要是听了医生的建议，现在可能还活着。