Final answer:
An introduction to a flashback is a sentence or paragraph that sets the stage for the flashback and provides context for the reader.
Step-by-step explanation:
An introduction to a flashback is a sentence or paragraph that sets the stage for the flashback and provides context for the reader. It often refers to a past experience or memory. In this case, sentences that signal a flashback could be: Erica could remember being four years old and being held by her mother and Bryan laughed as he remembered his first day of kindergarten. These sentences indicate that the characters are recalling something from their past.
Learn more about flashbacks in writing