Modals in Past in English

Modals in Past in English, Modal verbs in english, would have v3, could have v3, may have v3, might have v3, should have v3, must have v3;

Modals in Past

Modal + have + participle

Would havePast unreal actionIf I had guessed the future, I would have taken some precautions againist what would happen.
Could havePast unreal abilityHe could have taken the flight.
May havePast unreal possibilityWe may have passed the math exam, but it was in Spanish.
Might havePast unreal small probabilityYou might have sold the car., if you really needed the Money.
Should havePast unreal recommendationYou should have listened to the teacher.
Must havePast unreal assumptionWe must have been crazy!