If I had studied hard, I would have passed my exam.
If they hadn’t worked long hours, they wouldn’t have become rich.
If Mary had been more careful, she wouldn’t have fallen downstairs.
If John hadn’t driven so fast, the accident would have been prevented.
If I had asked her out, she would have said no.
If our friends had invited us, we would have come.
If we had got married 10 years ago, we would be happy now.