Fragments are among the most serious errors in academic writing. While you may read fiction and informal prose that contain sentence fragments, in academic writing, fragments are generally frowned upon. In fact, research on how errors are perceived by people indicates that fragments are what we call “status marking” errors, which means people will make negative assumptions about the intelligence of the writer when they see fragments in writing.
Of course, making a sentence fragment error has nothing to do with your intelligence. Usually, for native speakers of English, making a sentence fragment error is more about not editing carefully or just not being practiced in the rules.
In this video, the Grammar Professor will review what a fragment is and how you can avoid fragments in your academic writing.