A man races a blue motorcycle on a track.
A man is on the track
Just because the motorcycle is on the track, that does not mean the man is on the track.
all s1 x1.((n_motorcycle(x1) & a_blue(s1) & Theme(s1,x1)) -> exists x2 x3 x4.(a_topic(x2) & on(x2,x4) & n_track(x4) & for(x2,x1) & n_race(x2) & of(x2,x3) & n_man(x3)))
exists p1 x1 x2.(n_track(x2) & on(x1,x2) & n_man(x1))