1. If he had slipped, he would have fallen 500 metres.
2. If he asked you (that), would you accept (it)?
3. I would offer to help him if I knew that he was ill.
4. If I realized that he was a bad (ungifted) driver, I wouldn't go with him.
5. If you had told us that they had never payed their debts, we wouldn't have lent money to them.