A person is laughing on a roller coaster ride.
A person is on a roller coaster ride.
On a roller coaster ride a person is laughing.
exists e1 x1 x2 x3 x4.(on(e1,x2) & n_ride(x2) & of(x2,x4) & n_coaster(x4) & of(x2,x3) & n_roller(x3) & Actor(e1,x1) & v_laugh(e1) & n_person(x1))
exists p1 x1.(exists x2 x3 x4.(on(x1,x2) & n_ride(x2) & of(x2,x4) & n_coaster(x4) & of(x2,x3) & n_roller(x3)) & n_person(x1))