B)Model: I am sorry we didn't think about it before
I wish we had thought about it before
1. I am sorry you didn't see this film before.
2. I am sorry i didn't do it for you before.
3.I am sorry they didn't visit this museum.
4.I am sorry i wasn't there before.
5.I am sorry the didn't stage this performance before.
C)Model: If i saw this film i would tell you about it.
If i had seen this film yesterday i would have told you about it.
1.If you chose this room you would watch TV.
2.If you investigated this problem you would answer this question.
3.If he measured the temperature he would explain this phenomenon.
4.If they unified the facts they would prove the problem.
5.If they processed the data they would have the results