1.If farmers didn't use too many pesticides and herbicides,the soil wouldn't poisoned.
2.If you don't tell me what's wrong, I can't help you.
3.If the food wasn't contaminated , many people hadn't stomachache.
4.If you stop swimming in that lake , you won't have skin rashes .
5.If John didn't live in the are affected by air pollution,he wouldn't have breathing problem.