What does XJ Kennedy mean when he writes “Maneuvering steep stairs / of bedsprings to our car,” in Dump? I want to know what makes it a metaphor and what it mean

"this year she had the extra joy of showing it to her small brother, and of terrifying him as well as herself. when they had done this many times they came back to the house to tell everybody that they had done it. he boasted. she mocked. they squabbled." how does julia feel about her little brother? does she love him? hate him? find him an annoyance? be sure you read what is implied by their reactions to each other.

Hey can you guys keep , more questions are coming

Which of these can an adverbial clause modify?