1. She lost an umbrella a week ago and is buying a new one now. (past simple; present continuous)
2. It is usually sunny in Florida, but it is raining now.(present simple; present continuous)
3. Climate of England is very variable.(present simple)
4. Do you know anything about the cause of the greenhouse effect?(present simple)
5. Our nature is very fragile.(present simple)
6. Synoptics are gathering information for weather forecasting for tomorrow.(present continuous)
7. It has been snowing since the night.(present perfect)
8. We have just come home. We are very wet.(present perfect; present simple)