Second Conditional Sentence is used to express our wish toward condition and situation. Wish can be meant as a feel or express a strong desire or hope for something that is not easily attainable; want something that cannot or probably will not happen.
When making a wish in sentences, we have to know the rule as mentioned below
if + past simple, ...would/could/should + infinitive
example:
1. If I won the lottery, I would buy a big house.(I probably won't win the lottery)
2. If I met the Queen of England, I would say hello.
3.She would travel all over the world if she were rich.
4. She would pass the exam if she ever studied.(She never studies, so this won't happen)