Definition: used to talk about what would/might/could, etc. have happened Level: B2
如果我早知道交通状况，我就会早点出发了。
___If I had known about the traffic, I would have left earlier.
如果你给我打了电话，我本可以帮你解决问题。
___If you had called me, I could have helped you with the problem.
如果他们学习更努力些，他们可能就通过考试了。
___If they had studied harder, they might have passed the exam.
