In a free verse poem you can do almost anything that you want. There is no specific form or meter to a free verse. There is also no specific rhyme or rhythm pattern. In some free verses poets use the same phrase or even sound over and over again so that its not more like a book its a poem.
After the Sea-Ship by Walt Whitman
After the Sea-Ship—after the whistling winds;
After the white-gray sails, taut to their spars and ropes,
Below, a myriad, myriad waves, hastening, lifting up their necks,
Tending in ceaseless flow toward the track of the ship.