If you (can) swap places with someone for a day, who (you / change) places with?
could, would you change
If you (meet) an alien, what questions (you / ask) him?
met, would you ask
If you (be) an animal, what (you / be)?
were, would you be
If a fortune-teller (offer) to answer one question about your future, what (you / ask)?
offered, would you ask
Who (you / invite) if you (have) the chance to go for dinner with someone famous?
would you invite, had
What age (you / be) if you (can) be any age right now?
would you be, could
Which year (you / go) to if you (can) travel backwards in time?
would you go/ could
If you (can) change one thing about yourself, what (it / be)?
could/ would it be