Someone on a white motorcycle wearing black and red driving down a road.
They are not wearing a helmet.
A motorcyclist should use a helmet, but they do not always do so.
exists e1 s1 s2 s3 x1 x2 x3 x4 x5.(a_topic(x1) & on(x1,x2) & down(e1,x5) & n_road(x5) & Theme(e1,x4) & Actor(e1,x3) & v_wear(e1) & n_driving(x4) & a_red(s3) & Theme(s3,x4) & a_black(s2) & Theme(s2,x4) & (x2 = x3) & n_motorcycle(x2) & a_white(s1) & Theme(s1,x2) & n_person(x1))
exists x1.(n_thing(x1) & -exists e1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_wear(e1) & n_helmet(x2)))