A man on a speed motorcycle rides on a track.
The man stands on the bleachers.
A man cannot ride on a track and stand on the bleachers at the same time, they are to different tasks.
exists e1 x1 x2 x3 x4.(on(e1,x4) & n_track(x4) & Actor(e1,x1) & v_ride(e1) & on(x1,x2) & n_motorcycle(x2) & of(x2,x3) & n_speed(x3) & n_man(x1))
exists e1 x1 x2.(n_bleacher(x2) & n_man(x1) & on(e1,x2) & Actor(e1,x1) & v_stand(e1))