Sentence 1: David and Pam went to a coffee shop. 
 Sentence 3: But Pam clumsily spilled coffee on her skirt 
 Sentence 4:  She did not want to look stupid in front of David 
 Sentence 5:  So she blamed the coffee shop for her cup having a broken lid 
 Given Sentence 2: I didn't understand why I had to go.