理工类辅导资料：句型分析If I had V-edI 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<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>(would，should，ought to，might，could) 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(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<时态>不一致时的假设<句型>，亦称混合假设条件句。即：if <子句>若与过去事实相反，用<过去完成式>表示；而<主要子句>若与现在事实相反，则用过去式<助动词>表示。此类<主要子句>句尾通常有表现在的<时间副词>，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。