Ответ:
1. If I were old enough, I would receive a pension
2. If my friends come to my house today, we will watch films together
3. If I was rich, I would donate money to charities
4. If someone invited me to London, I would go there with that person
5. If my friends forgot my bday, I would never talk to them anymore
6. If I wanted to lose a weight, I would stop eating so many pizza
7. If I studied harder, I would be proud of myself
8. If I go to the beach, I will not swim because it's to cold outside