If I'd left sooner, I'd have been on time.要是我早点动身，我就准时到了。(但我动身太迟了)
If we had found him earlier we could have saved his life.要是我们当时早点找到他的话，我们就可以救活他。(可惜我们找到他太晚了)
If I had known that you were coming I would have met you at the air-port.要是我早知道你要来的话，我就会在机场接你了。
If he had lived, some day Michael would have done something important.假定麦克尔当时在世的话，他本可做出了不起的事。
If I had known how he felt, I would never have let him adopt those children.我要是知道他的想法，我是决不会让他领养那些孩子的。
He would have forgotten the boy’s birthday if you hadn’t reminded him.要不是你提醒他，他会忘记这男孩的生日的。
Our lives would have been greatly impoverished if we had not known our dear friend.若不是得识我们这位好朋友，我们的生活一定十分不妙。
