My problem is that I was taught (I think wrongly) that whenever a conditional sentence refers to past, there should be past perfect tense in the if clause, as in example 1.
If you hadn't broken the vase, you wouldn't have angered your parents.
[He broke the vase, no doubt about it.]
But is example 2 still a conditional sentence, and is it correct?
If you didn't break the vase, who did?
We're still referring to past, but we don't really know whether he did it or not.
Is this an example of a conditional sentence? Why or why not? How do I recognize a "past" conditional sentence?