Language Center Program, Writing Tips
Volunteer State Community College | Division of Humanities
One way to identify introductory material is to find the subject of the sentence and then note whether or not there is anything to the LEFT of the subject. If so, place a comma at the end of the material, just before the subject. “Subject” in this case refers to the grammatical subject as well as any words connected to it (articles and/or modifiers).
FYI: Introductory material may be a single word or many words.
