1 If I know, I will tell you. If I knew, I would tell you. 2 If she wants to talk, she will ring up.If she wanted to talk, she would ring up.3 If he has enough money, he will buy a large house. If he had enough money, he would buy a large house.4 She will feel lonely, if Peter goes away. She would feel lonely, if Peter went away. 5 We will be pleased to see you if you arrive. We would be pleased to see you if you arrived.6 If we can come on Sunday, we will come.If we could come on Sunday, we would come.7 I will understand Mr Smith if he speaks slowly. I would understand Mr. Smith if he spoke slowly. 8 We won't go by ship unless there is no other way.We wouldn't go by ship unless there were no other way.