Sentence 1: Ed tossed a bag of chips into his backpack before he walked to school. 
 Sentence 3: At lunch he opened his bag to get his chips 
 Sentence 4:  The books had crushed all of Ed's chips 
 Sentence 5:  Ed had to eat the destroyed chips for lunch 
 Given Sentence 2: He asked his teacher for help, and she said yes.