Perfect Modal Verbs in English and Example Sentences

Modal	Example
Would have	If I had guessed the future, I would have taken some precautions against what would happen.
Could have	He could have taken the flight.
May have	We may have passed the math exam, but it was in Spanish.
Might have	You might have sold the car., if you really needed the Money.
Should have	You should have listened to the teacher.
Must have	We must have been crazy!
Shouldn’t have	He shouldn’t have told the.
Needn’t have	You needn’t have bought it, because I have already.
Ought to have	You ought to have warned me earlier.