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.