1 If he calls, will I let him know about the change in plans?
2 If he had more free time would he spend it with his children?
3 If you don't like the present, you can always take it back.
4 If they had had the money, they would have had a bigger wedding.
5 He would write to me if he had my address.
6 You won't regret it if you buy it now.
7 Would you have apologised to him if he had asked you to?
8 I would have met her if she had called earlier.
9 If he had recognized me, he would have stopped to talk to me.
10 Unless you leave on time, you will miss the train.