An expository article is usually about explaining something or talking about it. So if it's a true story and you write it like a life story then yes it can be. If it's just a fictional story you want to write then no.
Things that are opposite
Ex: Jumbo shrimp
Shrimp could never me jumbo
Ex: Bitter sweet
This is false. You have to put quotations around it but you can cite the author at the bottom
Slang, it's a phrase tht people have developed
