Ответ:
1) 1. The cat wouldn't have scratched Tom if he hadn’t tried to pull his tail.
2. If I were you, I would be more careful with this snake.
3. If I ate breakfast in the morning, I would have been more attentive on my Maths lesson.
4. If you do not water grass, it doesn't grow.
5. Your headache will go away if you take a pill.
6. If Mary exercised regularly, she would be in a better shape.
7. If you call 999, the operator will connect you to the emergency service you want.
2) 1. You mustn’t approach a wild animal – it can be very dangerous.
2. Facing your phobias might help you to overcome your fears.
3. You needn’t be an expert in karate to learn how to defend yourself.
4. If someone tries to snatch your bag, you shouldn’t put up a fight, just run away.
5. If you don’t have a pencil, you may take mine.