If youhad toldme about the problem, Iwould have helpedyou. 실제로는 그 문제에 대해 말하지 않아서 도와주지 못했다.
If theyhad studied, theywould have passedthe exam. 실제로는 공부를 하지 않아 시험에 떨어졌다.
대개 조동사는 부정어와 함께 나타나면 축약된다.
If Ihadn't slippedon the ice, Iwouldn't have brokenmy arm. 실제로는 얼음판에서 미끄러져 팔을 다쳤다.
예 Linda wasn't at home yesterday. If she had been at home yesterday, I would have visited her. Jim isn't home right now. If he were at home right now, I would visit him.
If the weather had been nice yesterday, we would have gone to the zoo. If the weather is nice today, we would go to the zoo.