If you or I or Wendy had been there we should have seen that he was very like Mrs. Darling's kiss.
我们应该看到它很像达令夫人的吻
非真实条件句表示过去的情况，条件从句中的谓语动词用过去完成式，主句中用should (would, could或might) have加上-ed分词。如：
If I had been in Peking, I would have seen her.
（如果我当时在北京，我早就去看她了。）
If he had known it then, he might have told her.
（如果他那时知道这件事，他早就告诉她了。）
表示现在的是if i were you, i would......
