Sentence 1: One day Susan was driving when she saw a man with crutches fall down. 
 Sentence 3: She walked over and helped him stand up 
 Sentence 4:  He thanked her profusely 
 Sentence 5:  Susan felt good after that 
 Option 1: She stopped her car to help him. 
 Option 2: She didn't stop her car to help him.