The Brainliest Answer!
Your question would very well explain the main theme of the poem, that is, the fact that human life is mortal while the beauty of nature remains eternal. The brook says in these lines that human lives come to an end and another generation begins. However, the flow of the brook is continuous and goes on forever. The immortality and permanence of the brook has been compared and contrasted with human life, which is mortal and finishes after a certain span of time.
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thank u so much for ur answer