Sentence 1: As Nell waded in the lake, she saw a beautiful stone on the bottom. 
 Sentence 3: Nell's mom saw her daughter's head dip under the water 
 Sentence 4:  Then she ran and pulled Nell, holding the stone, from the water 
 Sentence 5:  Nell hadn't wanted to let go of the stone, which she couldn't lift 
 Given Sentence 2: She couldn't reach the stone without going under water.