If + past perfect + would/might/could have done
If + past perfect + would/might/could have done
"If I had revised, I would have passed my exams."
"If we had gone out earlier, we might have got to the cinema on time."
"If you had toldme there was a problem, I could have helped."
In these sentences (or third conditional sentences), the first part of the sentence with if didn't happen. So there is no possibility of the second part of the sentence happening. I didn't revise, so I didn't pass my exams and there is nothing I can do about it now. English speakers use this type of sentence to show
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