A person in a hard hat is doing some work on a train track.
There is a person working to fix a broken part of a train track.
A person in a hard hat is doing some work on a train track does not imply that he is working to fix a broken part of a train track
exists e1 s1 x1 x2 x3 x4 x5.(Theme(e1,x3) & Actor(e1,x1) & v_do(e1) & on(x3,x4) & n_track(x4) & of(x4,x5) & n_train(x5) & n_work(x3) & in(x1,x2) & n_hat(x2) & a_hard(s1) & Theme(s1,x2) & n_person(x1))
exists p1 x1 e1 p2 x2 x3.((x1 = x2) & Topic(e1,p2) & Actor(e1,x3) & v_work(e1) & exists e2 s1 x4 x5 x6.(Theme(e2,x4) & Actor(e2,x3) & v_fix(e2) & of(x4,x5) & n_track(x5) & of(x5,x6) & n_train(x6) & n_part(x4) & a_broken(s1) & Theme(s1,x4)) & (x2 = x3) & n_person(x2))