I have stepped on the brakes. Otherwise, I would have hit the child on the bicycle-> If. If you hadn't helped us, we would have been in trouble-> If it. If it were not for your permission, he would not do that-> If

1. I have stepped on the brakes. Otherwise, I would have hit the child on the bicycle
-> If........................................................
2. If you hadn't helped us, we would have been in trouble
-> If it.....................................
3. If it were not for your permission, he would not do that.
-> If..........................................................