Task: Coherence Classification
Input (English): Sentence1: Mark and Frank were swimming in Mark's family's pool. Sentence2: Mark's mother brought out a sponge ball to them. Sentence3: Mark and Frank had fun tossing the ball back and forth. Sentence4: But then the saturated ball accidentally hit Mark's mother! 
 Sentence5: Mark and Frank apologized profusely.
Output (English): Yes