A man working on a train track.
A man tries to fix the tracks.
Not all men working on train tracks are there to fix the tracks.
exists e1 x1 x2 x3 x4.(a_topic(x1) & on(e1,x3) & n_track(x3) & of(x3,x4) & n_train(x4) & Actor(e1,x2) & v_work(e1) & (x1 = x2) & n_man(x1))
exists e1 p1 x1 x2.(n_track(x2) & Topic(e1,p1) & Actor(e1,x1) & v_try(e1) & exists e2.(Theme(e2,x2) & Actor(e2,x1) & v_fix(e2)) & n_man(x1))