A construction worker is fixing a large machine.
a man fixes a tractor
The man could be fixing a different large machine than a tractor.
exists e1 s1 x1 x2 x3.(Theme(e1,x3) & Actor(e1,x1) & v_fix(e1) & n_machine(x3) & a_large(s1) & Theme(s1,x3) & n_worker(x1) & of(x1,x2) & n_construction(x2))
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_fix(e1) & n_tractor(x2) & n_man(x1))