Answer: when the writer uses a group of words that does not express a complete thought
"An" is one of two indefinite articles.
Ill give you a paragraph to give you ideas so you dont get busted for plagiarism
It was a tuesday and I was in Detention. My teacher thought I was Talking trash about her but I haven't even opened my mouth. It turns out she can read minds. Let me tell you how I found out. I was sitting in her math class waiting for it to start when she called my best friend up to the front of the class and told her off for not turning in her homework on time! Her dad died yesterday and her mom even sent her an email so to myself i thought wow what a witch! Shes mourning the loss of her father! That is when she told me to stay after class.
Hopefully this can give you ideas let me know if you need more!
