A man operating a large tractor.
The woman sits on the green couch.
One is either a man or a woman. One cannot be operating while one sits at the same time. There can be either a tractor or a couch.
exists e1 s1 x1 x2 x3.(a_topic(x1) & Theme(e1,x3) & Actor(e1,x2) & v_operate(e1) & n_tractor(x3) & a_large(s1) & Theme(s1,x3) & (x1 = x2) & n_man(x1))
exists e1 s1 x1 x2.(n_couch(x2) & a_green(s1) & Theme(s1,x2) & n_woman(x1) & on(e1,x2) & Actor(e1,x1) & v_sit(e1))