story: Darrel was helping his brother with his homework. His brother didn't understand what Darrel was showing him. They decided to take a break. Darrel tried to explain the problem again. His brother understood much better after he had rested.
 selected sentence: Darrel was helping his brother with his homework.
Darrel's brother asks before help with his homework >Causes/Enables> Darrel is helping his brother with his homework