1. Hellen takes the umbrella if it rains.
2. If John knows how difficult the exam is, he doesnt take it.
3. If Marry has a country house, she takes up gardening.
4. Water boils if the temperature is 100 degrees above zero.
5. If a better dress exists, Sue buys it for sure.
6. If Bob agrees on the subject, he changes his attitude to it.
7. When the night comes, the weather becomes colder.
Объяснение: