點擊查看：2014年職稱英語衛生類語法精講:假設法句型匯總

　　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;而若與現在事實相反，則用過去式表示。此類句尾通常有表現在的，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.

　　當時他要是聽了醫生的建議，現在可能還活著。