A guy is rock climbing.
A man is sitting on a couch.
The man cannot go rock climbing while sitting on the couch.
exists p1 x1.(exists x2 x3.((x1 = x2) & n_climb(x2) & of(x2,x3) & n_rock(x3)) & n_guy(x1))
exists e1 x1 x2.(on(e1,x2) & n_couch(x2) & Actor(e1,x1) & v_sit(e1) & n_man(x1))