Ответ:
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.
Объяснение: