Remember that there are three types of conditionals

This is the first conditional.

This is the first conditional.
You know you have a conditional sentence with "if".
Use the future simple with the present simple to express conditional circumstances.
Future with will. Present simple with if.

Structure
If + present simple / future simple
If I see Jack I will say hello.


The first conditional expression a condition that might happen.

Structure

If my boss is at work tomorrow, I will discuss the project.
If they come to work we will meet them.
If I do not see Jack I will tell you.
I will not go to the presentation if he isn't there.