Sure! Here are the rewritten sentences:

1. Alice might miss the train, but she can take the next one. (If)
- If Alice misses the train, she can get the next one.

2. Jenny finds reading poetry to be boring. (dislike)
- Jenny dislikes reading poetry.

3. Don’t touch that wire; you might receive an electric shock. (If)
- If you touch that wire, you may get an electric shock.

4. Anna prefers swimming in the sea to swimming in the pool. (prefer)
- Anna prefers swimming in the sea over swimming in the pool.

5. Stop polluting the water; otherwise, people and animals will suffer from more diseases. (Unless)
- Unless we stop polluting the water, there will be more diseases in people and animals.

6. Protect the forests or animals will lose their homes. (Unless)
- Unless we protect the forests, animals will lose their homes.

7. I would prefer to play tug of war because it is more relaxing than folk games.
- I prefer playing tug of war because it is more relaxing than folk games.

8. There is not enough fresh air in the city. (be)
- There is not enough fresh air in the city.

Feel free to ask if you need more help!