A guy on a motorcycle at a streetlight.
A motorcyclist stopped at a streetlight.
guy is motorcyclist
exists x1 x2 x3.(a_topic(x1) & on(x1,x2) & at(x2,x3) & n_streetlight(x3) & n_motorcycle(x2) & n_guy(x1))
exists e1 x1 x2.(at(e1,x2) & n_streetlight(x2) & Actor(e1,x1) & v_stop(e1) & n_motorcyclist(x1))