Use the excerpt from "Birches" by Robert Frost to answer the question.

"When I see birches bend to left and right

Across the lines of straighter darker trees,

I like to think some boy's been swinging them.

But swinging doesn't bend them down to stay."

In 3–5 sentences, write about the author’s repetitive use of the “b” sound and its significance in the excerpt. Use details from the excerpt to support your ideas.