story: Mable knew she couldn't mow her lawn at her advanced age. She went next door and asked the neighbor boy if he would do it. The boy agreed and mowed her lawn for her. When Mabel went to give the boy money he wouldn't take it. Mable shed a tear from the boy's kindness.
 selected sentence: When Mabel went to give the boy money he wouldn't take it.
The boy won't take money from Mabel >Causes/Enables> Mabel sheds a tear