Real and Unreal Conditionals; Wishes

Present/Future Real Conditionals
       if clause with simple present
       main clause with simple present, future,
              modal, or imperative

 Present/Future Unreal Conditionals
       if clause with simple past
       main clause with would/could/might +
              verb
     
Wishes About the Present and Future
       I wish + (that +) subject + past form

Remember:

When the if clause comes before the main clause, it is followed by a comma.

In wishes and unreal conditional if clauses containing the verb be, we use were for all subjects.