Bonjour Ruth,
I suspect that the phrase "And as if that wasn't enough" from the lesson, is what you are querying.
The imparfait relates to "was / were / would" in English.
What we have here in the lesson is one of those situations "And as if that wasn't enough"
--> "If that was not enough..." this is the key to your query and why the imparfait is being used in this case.
Hope this helps
Bonne continuation
Jim
