Sentence 1: Bill saw tadpoles in the pond by his house. 
 Sentence 3: He went every day to see them swim and grow bigger 
 Sentence 4:  Soon the tadpoles lost their tails and grew bigger 
 Sentence 5:  Before long, Bill's tadpoles all morphed into frogs! 
 Given Sentence 2: While cleaning his room, the book was pushed under his bed.