1. if the weather is warm, we will go to the zoo
2. but if the weather is cold, we will visit a museum or a gallery
3. if Dima comes, we will go skating to the river
4. but if Dima does not come, we will go skating tothe skating-rink
5. if we go to the zoo, I will see a real Russian bear
6. if we don't go to the zoo, we will go to the circus and see a real bear skating there