If he hadn’t been angry, I would have said something.
=> Had.............................

If the computer hadn’t broken down and I wouldn’t have had to stop my work.
=> Had....................................

If she had said sorry, he wouldn’t have been angry.
=> Had..............................

If he weren’t busy right now, he could help them.

=> Were.............................

If I were you, I would tell him the truth.
=> Were..............................

If I were rich, I could afford to buy an expensive car.
=> Were............................

I didn’t see the signal, so I didn’t stop.
=> Had............................

Would you visit me if I were sent to prison?
=> Were...........................

If the salary were high, the job would be worth doing.
=> Were...........................

If you change your mind, there will always be a job for you here.
=> Should................................