Lines 11–18: What key concept does Soto develop? How do the sentences in these lines build on that idea?
(PLEASE HELP BY READING THE HIGHLIGHTED TEXT AND ANSWERING IT)

In lines 11-18, Soto focuses on the concept of how men and women worked hard for many years until they retired. The put forward this fact by giving example of his grandfather and grandmother.

Explanation:

The highlighted lines are from a narrative essay 'One last time' written by Gary Soto. Here, Soto illustrates how he grew up in an immigrant family and how his Grandfather and Grandmother worked with blue collar jobs.

In these sentences, Soto provides details of his grandfather and grandmother's job. He states how both his grandma worked for whole twenty years and retired at the age of sixty five.