Boy driving a motorcycle with a girl sitting on back.
Girl driving a motorcycle with a boy sitting on back.
Either the boy is driving with the girl on back or the girl is driving with the boy on the back, but not both at the same time.
exists e1 e2 x1 x2 x3 x4 x5.(ne_nam_boy(x1) & with(e1,x3) & on(e2,x5) & n_back(x5) & Actor(e2,x4) & v_sit(e2) & (x3 = x4) & n_girl(x3) & Theme(e1,x2) & Actor(e1,x1) & v_drive(e1) & n_motorcycle(x2))
exists e1 e2 x1 x2 x3 x4 x5.(ne_nam_girl(x1) & with(e1,x3) & on(e2,x5) & n_back(x5) & Actor(e2,x4) & v_sit(e2) & (x3 = x4) & n_boy(x3) & Theme(e1,x2) & Actor(e1,x1) & v_drive(e1) & n_motorcycle(x2))