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.