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

結構：If…had+過去分詞…，主詞+would/should 等+have+過去分詞

說明：這是與過去事實相反的假設。if 要用，則要用過去式(would，should，ought to，might，could)+have+過去。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. 如果我當時看見他，我會告訴他實情。

I could have finished the task if I had had more time.

如果當時我能有多一點時間，我就能完成這項任務。

If we had known of your departure, we would have seen you off at the airport.

如果我們事先知道你要離開，我們會到機場送行。

I someone had been with him, he might not have been drowned.

如果有人在他旁邊，或許他就不會溺死。

I might have been incredulous had I not been accustomed to such responses.

若非我已經習慣了這樣的回答，我可能不敢輕易相信。

Had he not apologize to her, she would not have forgiven him.

她(那時)不會原諒他，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?

我要是當年向你求婚，你會答應嫁給我嗎?

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

假如沒有你的幫助，這筆生意早就告吹了。

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

結構︰If…had+過去分詞…，主詞+would/should 等+原形動詞+now/today

說明︰這是不一致時的假設，亦稱混合假設條件句。即：if 若與過去事實相反，用表示;而若與現(xiàn)在事實相反，則用過去式表示。此類句尾通常有表現(xiàn)在的，如 now，today 等。

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

如果他年輕時多努力一點，現(xiàn)在就能過得舒服些。

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

如果十年前我有錢，今天我就能買下那棟房子了。

Had he told the truth, he wouldn’t be punished now.如果他當時肯說實話，現(xiàn)在就不會受罪了。

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

當時他要是聽了醫(yī)生的建議，現(xiàn)在可能還活著。