如果我们当时有钱,我们就会买一辆新车。
___If we'd had the money, we'd have bought a new car.
如果你早点提到这个,可能就没必要叫医生了。
___If you'd mentioned this earlier, it might not have been necessary to call the doctor.
如果我知道有派对,我就会参加了。
___If I had known about the party, I would have attended.