Mabel attends a party hosted by Clarissa Dalloway and immediately feels insecure about her new dress. She worries that her dress is inappropriate and that others will mock her appearance. Mabel's insecurities and feelings of inferiority overwhelm her at the party. The lesson teaches students about constructing sentences using the subject-linking verb-complement (S-LV-C) pattern and discusses how insecurities can negatively impact one's life, as shown through Mabel's experience in the story.