Ответ:
3)
1.if people eat less, they feel better.
2. i wouldn't go out, if i were you.
3. if it rains, i won't go to the park.
4.if i had a lot of money, I would travel round the world.
5. If the weather had been nice 2 dys ago, I would have gone to the beach
4)
1. have read
2. has already made
3. have finished
4.hasn't returned
5. has completed