Sentence 1: Tina was supposed to be home at 6 for dinner. 
 Sentence 3: Her mom called her best friend Lisa 
 Sentence 4:  Lisa said they were at the movies 
 Sentence 5:  Tina's mom picked up Lisa and grounded her for a month 
 Option 1: When she came home at 7, her mother wasn't worried. 
 Option 2: When she didn't come home by 7, her mother was worried.