What is the boy now, who has lost his ball,
what, what is he to do? i saw it go
merrily bouncing, down the street, and then
merrily over—there it is in the water!
no use to say ‘o there are other balls’

source: berryman, john. “the ball poem.” collected poems: 1937 – 1971. ed. charles thornbury. new york: farrar, straus and giroux, 1991. google books. web. 06 june 2011.

what is the structure of this poem?

free verse
blank verse
sonnet
ballad