A man on a motorcycle is racing on a track.
A man on a motorcycle is racing other motorcycles around the track.
A man on a motorcycle is racing on a track does not mean that he is racing other motorcycles around the track.
exists e1 x1 x2 x3.(on(e1,x3) & n_track(x3) & Actor(e1,x1) & v_race(e1) & on(x1,x2) & n_motorcycle(x2) & n_man(x1))
exists e1 x1 x2 x3 x4.(n_track(x4) & Theme(e1,x3) & Actor(e1,x1) & v_race(e1) & around(x3,x4) & -(x3 = x2) & n_motorcycle(x2) & n_motorcycle(x2) & n_motorcycle(x3) & on(x1,x2) & n_man(x1))