Construction worker doing his job on scaffolding.
The contractor sits down to enjoy his lunch break.
A contractor is not a construction worker. One cannot be doing his job while enjoying his lunch break.
exists e1 x1 x2 x3 x4 x5.(a_topic(x1) & Theme(e1,x4) & Actor(e1,x3) & v_do(e1) & on(x4,x5) & n_scaffolding(x5) & n_job(x4) & of(x4,x1) & n_male(x1) & (x1 = x3) & n_worker(x1) & of(x1,x2) & n_construction(x2))
exists e1 p1 s1 x1 x2 x3.(n_break(x2) & of(x2,x3) & n_lunch(x3) & of(x2,x1) & n_male(x1) & n_contractor(x1) & a_down(s1) & Manner(e1,s1) & Topic(e1,p1) & Actor(e1,x1) & v_sit(e1) & exists e2.(Theme(e2,x2) & Actor(e2,x1) & v_enjoy(e2)))