Well, there are some simple but very deep lines written by Hughes which pose as an allusion to the Whitman's poem, and the way readers can recognize it during acquaintance with these authors is being hidden inthe very first<span> line of the poem (“I, too, sing America”) which is commonly known as a direct response to Whitman’s “I Hear America Singing.” </span>I am pretty sure it will help you!
The present perfect tense is used when talking about experiences from the past, a change or a situation that has happened in the past but is still continuing today.