Rule: Conditional sentences with "if" and "unless". Unless + verb in the affirmative form = if + verb in the negative form. Rewrite the following sentences beginning them as indicated below and make the necessary transformations:
3. Unless I have you here with me, I will feel unhappy. If...
4. Unless you go with him, he won't be able to help you. If...
5. I would like to go to Britain if the weather were better. Unless...
6. I'll teach you if you have time to spare. Unless...
7. Unless you lock the back door, you will be stolen. If...
8. If she pays the bill, they won't cut off her telephone. Unless...
9. If he doesn't meet strong opposition, he won't give up. Unless...
10. Unless we hurry, we will be late. If...
11. If they don't learn the rules, they won't adapt. Unless...
12. Unless the weather gets better, I will stay home. If...
13. If the policeman didn't help me, I wouldn't find the house. Unless...
14. I'll go to the cinema tonight if I don't find anything better to do. Unless...

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