If, when
Lesson 18
If I have money, I will buy it.
When I have money, I will buy it.
When we speak about the future, we use the present simple after if and when.
Examples
If you come at four, I will be happy.
If you travel a lot, this information will help you.
When I leave you, you will be sad.
When you look at the stars, you will smile.
You can see more examples in the book The Little Prince.