1.be a 20-year-old girl/run for(竞选)the super voice girls→ If I were a 20-year-old girl,I would run for the super voice girls
2.find a wallet/open it and have a look→ If I found a wallet,I would open it and have a look.
3.lose mywallet in the classroom/tell my teacher→ If I lost my wallet in the classroom,I would tell my teacher.
4.someone asks me to be in a movie/try to be a superstar→ If someone asked me to be in a movie,I would try to be a superstar,I would try be a superstar.
5.can fly/never need a car→ If I could fly,I would never a car.
6.meet an alien/visit his planet→ If I met an alien,they would visit his plant.