This question is in the second conditional:
If + past + I would + infinitive
If I worked in a chocolate factory, I would hate eating chocolate.
Si je travaillais dans une chocolaterie, je détesterais manger du chocolat
What would you do if you won ten million Euros on the lottery?
Que feriez-vous si vous gagniez 10m € au loto?
This grammar point is covered on page 51 of your book ‘Free English Grammar’
Here are some more hypothetical questions. Choose one to anwser in the comments section below. If you’d like to have these questions to print, there is a PDF version here
1.What would you do if you found €10000 in an unmarked envelope?
2.What would you do if you if could be invisible for a day?
3.What would you do if you were president of the world?
4.What would you do if you if you only had one day to live?
5.What would you do if your car broke down on the way to a very important meeting, and you realised your phone had no battery?
6.What would you do if you had invited some important customers to a restaurant and you realised that you had left your money and credit cards at home?
7.What would you do if you saw a colleague stealing office supplies?
8.What would you do if you dreamed a good friend was going to have a terrible accident?