He is so strong that he can lift the box.
=> So..............................

The weather is so beautiful that we decided to go to the beach.
=> So....................

if his friends hadn’t been late, they wouldn’t have missed the train
. => Had..............................

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............................