Past Unreal Conditionals - English Grammar

This is the fifth lesson on conditionals. It will be presented in 2 parts. This first part is mainly explanation of form and use of unreal conditionals in the past.
Level: high intermediate - adavanced.
Dear Viewers: Yes, I did make the mistake of calling one flag by the wrong name. To the English, I apologize. (Sadly, I think this is a common mistake among Americans!)