Sentence 1: Lucy had a friend named Lisa next door to her grandparents. 
 Sentence 3: They each grabbed one end of the rope 
 Sentence 4:  Lucy realized they only had 2 people, but they needed 3 
 Sentence 5:  They decided to jump together side by side with one rope 
 Given Sentence 2: He went to the doctor to find out what the problem was.