1) for imaginary situations ( hypothetical) in the present or future
- to talk about things in the future that are unlikely
- things that are impossible in the present situation
2) to give advice or suggestions
3) Hypothetical questions
If I won the lottery, I would buy three houses.
If I were a genius, I would know all the answers
if I were you.......I'd......
if you were the president of the United States, what would you do?