Here is an example summary of this reading selection:

In “The Dog Ate My Flash Drive and Other Tales of Woe,” Carolyn Foster Segal classifies the excuses of her students into five categories: Those who use family members (like dead or dying grandparents), those who use close friends’ emergencies, those who blame problematic roommates, those who use computer or printer malfunctions, and those who concoct freak accidents and wild happenstance.

Your summary will differ from this one in the way it is written, but it should include roughly the same information.