Sentence 1: Ian always let Lily copy his math homework before class. 
 Sentence 3: But the last two days of class, Ian was sick 
 Sentence 4:  And Lily didn't know what to do 
 Sentence 5:  On the day of the final exam, Lily failed 
 Option 1: And he let her cheat off him during tests too. 
 Option 2: And he never let her cheat off him again.